Highline Thermal Leggings

Superior Temperature Regulation & Warmth For Backcountry Layering

$79.97
Membership Pricing: $71.97

The Highline Thermal Leggings were built for max warmth in the backcountry at an ultralight weight.

  • Excellent stretch for optimal comfort
  • Faster dry times than other thermal leggings
  • Superior temperature regulation & venting
Size
What's My Size?

Description
Specs
  • Weight: Weight: 3.5 oz (size S)
  • Main Fabric: Proprietary polyester fleece by TORAY
  • Fabric Weight: 102 g/m2
  • Secondary Fabric: jersey knit mesh
  • Inseam Length: 30" (size M) -length changes 1 inch per size
  • Color: black
  • Gender: Male
  • Warranty: Outdoor Vitals Performance Promise
Key Features

Gusseted mesh crotch for optimal ventilation

100% polyester Japanese fabric

Brushed with proprietary process for maximum loft & warmth

Smooth exterior for better durability

Great stretch & shape retention

0% spandex for faster dry times & lighter weight

Very warm for ultralight sub 4 oz weight

How Warm Are The Highline Thermals?

How Should You Use The Highline Leggings?

How The Highline Leggings Fit

How Warm Are The Highline Thermals?

The Highline Thermal Leggings are designed to deliver maximum warmth for minimal weight. The brushed fleece interior traps heat efficiently, creating a thin layer of insulation without bulk.

Compared to traditional base layers, they provide significantly more warmth for their weight - making them ideal for camp, sleep systems, and cold-weather layering.

How Warm Are The Highline Thermals?

The Highline Thermal Leggings are designed to deliver maximum warmth for minimal weight. The brushed fleece interior traps heat efficiently, creating a thin layer of insulation without bulk.

Compared to traditional base layers, they provide significantly more warmth for their weight - making them ideal for camp, sleep systems, and cold-weather layering.

How Should You Use The Highline Leggings?

The Highline Thermal Leggings are designed primarily as a base layer. They are worn under shorts or pants for added warmth during hiking, or on their own while sleeping or at camp.

They are not intended for rugged use, but excel as part of a layering system where warmth and weight savings matter.

How Should You Use The Highline Leggings?

The Highline Thermal Leggings are designed primarily as a base layer. They are worn under shorts or pants for added warmth during hiking, or on their own while sleeping or at camp.

They are not intended for rugged use, but excel as part of a layering system where warmth and weight savings matter.

How The Highline Leggings Fit

The Highline Leggings are designed with a close-to-body fit to maximize thermal efficiency and layering performance. The stretch fabric allows full range of motion while keeping the material in contact with your skin for better warmth.

How The Highline Leggings Fit

The Highline Leggings are designed with a close-to-body fit to maximize thermal efficiency and layering performance. The stretch fabric allows full range of motion while keeping the material in contact with your skin for better warmth.

Key Features

More Warmth For Less Weight

To us, nothing is basic and nothing should be overlooked, so when we decided to design thermals we started by researching and testing a wide variety of fabric options, eventually landing on an ultra lightweight, 100% polyester, Japanese fabric that is lofted on the inside using a proprietary method to give you the most loft for the weight in its class.

Excellent Stretch With Faster Dry Times

The highline thermals offer great stretch and shape retention without the use of spandex - allowing less weight, faster dry times and more comfort next to skin.

More Warmth For Less Weight

To us, nothing is basic and nothing should be overlooked, so when we decided to design thermals we started by researching and testing a wide variety of fabric options, eventually landing on an ultra lightweight, 100% polyester, Japanese fabric that is lofted on the inside using a proprietary method to give you the most loft for the weight in its class.

Excellent Stretch With Faster Dry Times

The highline thermals offer great stretch and shape retention without the use of spandex - allowing less weight, faster dry times and more comfort next to skin.

Superior Temperature Regulation & Venting

When using thermals during the day or sleeping in them at night, a common problem is venting in target areas. We’ve added a vented crotch gusset to ensure warmth in the right areas and eliminate overheating in others. This allows you to extend your time in the thermals or sleep more comfortably through the night.

Ultralight Weight & Packability

These sub 4 ounce thermals take the edge off of those cold mornings, late nights or brisk winter trips all while packing down to nothing in your pack.

Superior Temperature Regulation & Venting

When using thermals during the day or sleeping in them at night, a common problem is venting in target areas. We’ve added a vented crotch gusset to ensure warmth in the right areas and eliminate overheating in others. This allows you to extend your time in the thermals or sleep more comfortably through the night.

Ultralight Weight & Packability

These sub 4 ounce thermals take the edge off of those cold mornings, late nights or brisk winter trips all while packing down to nothing in your pack.

Ideal For

  • backpackers
  • thru-hikers
  • cold mornings / evenings
  • camp use
  • sleep layer
OV Media Mentions OV Media Mentions OV Media Mentions

Design Story

Performance Metrics Relative To OV Products

Base Layer

Warmth

Breathability

Water Resistance

Wind Resistance

Durability

Stretch

Packability

Highline Thermal Leggings

4/10

8/10

2/10

3/10

4/10

6/10

6/10

Frequently Asked Questions

Product, Shipping, & Warranty Info

Full Description

Extremely high warmth for an ultralight weight.

 

Some chase the good weather. They plan everything according to convenience.

But others…well we don’t let cooler temps, mis-timed seasons, or mother nature dictate what we can or can’t do.

To us, we require more out of our gear to live life on our terms.
And that’s exactly why we need gear designed for maximum performance, such as the Highline Thermal Leggings.

More Warmth For Less Weight: To us, nothing is basic and nothing should be overlooked, so when we decided to design thermals we started by researching and testing a wide variety of fabric options, eventually landing on an ultra lightweight, 100% polyester, Japanese fabric that is lofted on the inside using a proprietary method to give you the most loft for the weight in its class.

Excellent Stretch With Faster Dry Times: The highline thermals offer great stretch and shape retention without the use of spandex - allowing less weight, faster dry times and more comfort next to skin.

Superior Temperature Regulation & Venting: When using thermals during the day or sleeping in them at night, a common problem is venting in target areas. We’ve added a vented crotch gusset to ensure warmth in the right areas and eliminate overheating in others. This allows you to extend your time in the thermals or sleep more comfortably through the night.

Ultralight Weight & Packability: These sub 4 ounce thermals take the edge off of those cold mornings, late nights or brisk winter trips all while packing down to nothing in your pack.

Whether you're embarking on a cold-weather hike, seeking a more comfortable sleeping set, or simply braving chilly mornings, our Highline Thermal Leggings will keep you warm and comfortable without weighing you down.

Product Care

Your Highline Thermal Leggings are a high performance piece of gear. They need some extra attention to keep it performing at the highest level.

Please read through the care instructions below to ensure that you care for them properly:

Before Washing

  • Never wash your Highline Thermal Leggings with anything with velcro or similar hook & loop characteristics.
  • Never wash your Highline Leggings in a washing machine that has an agitator.
  • If you cannot follow either of these prior instructions you should hand wash your product using the detergent and drying process described below.


The Wash & Dry Process

  1. Machine wash cold
  2. Do not use bleach
  3. Tumble dry low heat or hang dry
  4. Do not iron


For more information on caring for your gear please visit https://outdoorvitals.com/pages/care-guide-faq

How long does shipping take?

Orders for in-stock items will begin processing 1-2 days after your online purchase is completed. Please note that business days are Monday through Friday, excluding holidays in the United States. Once processed, Priority shipping generally takes 1-3 days to arrive. Note that USPS Priority shipping is a time estimate and not guaranteed. You will receive an email notification once your package leaves our warehouse.

If you place an order that includes a backordered or pre-sale item, we will hold the entire order until the pre-sale item is in stock. If you would like to receive the in-stock items sooner and split your order into two shipments, please place two separate orders or pay an additional shipping fee to have the order divided into two shipments.

Do you ship to addresses outside the US?

Some countries may be excluded from our shipping options due to extremely high shipping costs, unsafe conditions for US carriers, or unreliable delivery services. To check if we can ship to your country, please go to the Checkout page and enter your shipping address.

Customers have the option to prepay duties and taxes for certain countries. If these fees are not prepaid, customers may be responsible for them upon delivery, depending on the import laws and regulations of their respective countries. We recommend checking with your local customs office to see if these apply in your area. APC Economy Shipping

Please note that the situation regarding duties and taxes is constantly changing. We are working to stay updated on the varying shipping costs as they evolve. Also, Live Ultralight Members and Peak tier members do no get free shipping to international addresses.

What is your returns/exchange policy?

Shop with Confidence: OV's Simple Returns Policy

  • Free First Exchange:* Enjoy your first exchange at no extra cost with each order (USA only).
  • 60-Day Return Window:** You have 60 days to return items; this is extended to 90 days for purchases made in November and December.
  • Easy Return Shipping:* We provide return labels or QR codes for your convenience (USA & Canada only). 

For more information, please visit our Warranty/Returns page. 

https://outdoor-vitals.loopreturns.com/#/

*Please note: Clearance items are final sales and are not eligible for returns or exchanges. Items such as soft flasks (included with our Skyline Fastpack) cannot be returned due to sanitary reasons. If you choose to return your fastpack, a $15 charge per bottle or flask will be deducted from your refund, unless the bottles or flasks are returned with their original packaging still intact.

Do you have a product warranty?

Our gear is made with the goal in mind of balancing ultralight weight, performance, comfort and durability. We believe in the “Live Ultralight” mantra so we focus on ultralight weight and performance while maintaining durability thresholds established for each product.

Our warranty covers manufacturing & workmanship defects for the Expected Lifespan of our products. Expected Product Lifespan is determined by OV Gear Specialists using the following criteria:

  • Product design intent & materials specifications
  • Intended use of the product
  • The specific issue encountered with the product
  • The age of the product (based on Manufacture date)
What are the Highline Thermal Leggings best used for?

The Highline Thermal Leggings are best used as an ultralight thermal base layer for backpacking, thru-hiking, cold mornings and evenings, camp use, and sleeping. They are designed to add warmth underneath shorts or pants, or to be worn on their own while sleeping or around camp.

How warm are the Highline Thermal Leggings?

The Highline Thermal Leggings are designed to deliver maximum warmth for minimal weight. The brushed fleece interior traps body heat efficiently, creating a thin insulating layer without adding much bulk. They provide significantly more warmth for their weight than many traditional base layers, making them especially useful for camp, sleep systems, and cold-weather layering.

Can I hike in the Highline Thermal Leggings?

Yes, the Highline Thermal Leggings can be worn under shorts or pants while hiking for added warmth. They are designed primarily as a base layer, not as rugged standalone pants, so they perform best when layered under outerwear during active use.

Are the Highline Thermal Leggings durable enough to wear by themselves?

They can be worn by themselves for sleeping or around camp, but they are not intended for rugged standalone use. The smooth exterior improves durability for a lightweight thermal layer, but the Highline is still designed primarily as part of a layering system where warmth and weight savings matter most.

What makes the Highline Thermal Leggings different from other thermal leggings?

The Highline uses an ultralight 100% polyester Japanese fabric brushed with a proprietary process to create loft and warmth without much weight. The fabric also has stretch and shape retention without spandex, which helps reduce weight, speed up drying, and improve next-to-skin comfort.

Why don’t the Highline Thermal Leggings use spandex?

The Highline Thermal Leggings use 0% spandex to reduce weight and improve dry time. Instead, the polyester fabric provides stretch and shape retention without relying on spandex, helping the leggings stay light, comfortable, and faster-drying in backcountry conditions.

How do the Highline Thermal Leggings fit?

The Highline Thermal Leggings have a close-to-body fit to maximize thermal efficiency and layering performance. The stretch fabric allows full range of motion while keeping the material close to your skin, which helps retain warmth and makes them easier to layer under shorts, pants, or sleep clothes.

How much do the Highline Thermal Leggings weigh and pack down?

The Highline Thermal Leggings are described as sub 4 oz thermals and are designed to pack down very small in your backpack. They are built to take the edge off cold mornings, chilly nights, and brisk winter trips without adding noticeable bulk or weight.

How do I wash and care for the Highline Thermal Leggings?

Do not wash the Highline Thermal Leggings with Velcro or hook-and-loop items, and do not use a washing machine with an agitator. Machine wash cold, do not use bleach, tumble dry low or hang dry, and do not iron. Hand wash if you cannot follow those instructions.

  • 5 stars: 77 (88%)
  • 4 stars: 6 (7%)
  • 3 stars: 3 (3%)
  • 2 stars: 0 (0%)
  • 1 star: 2 (2%)
L
Luis Acosta
Awesome

Paired these with skyline trail shorts.
Great combination and quick drying which helps not having to pack additional gear. These kept me cool during the day with venting in the crotch area and warm in the chilly evenings.

C
Chris Tolman
Thermal leggings like no others

These thermal leggings are not like the thermals of old, I’ve had many kinds from Outdoor wear, Work wear, and high end Snowboard thermals. All of those have a thick cotton or brushed cotton feel that were noticeable tight and bulky under pants when layering.
These thermals feel sleek with a silky feel, They slide right into pants without any resistance, They feel like they aren’t even there, They are also light and pack away to nothing without sacrificing warmth, I was set on buying SmartWool thermals because I wanted the best, I didn’t even know OV made thermals, I was just going to buy a puffy jacket. I have found the best thermal leggings by accident and so glad I didn’t buy the SmartWool before trying OV.

A
Anonymous
Very warm

Nice thermals. Warm and comfortable. Little tight in the legs and could use a zipper on sides gor easy on and off.

H
Hangyeol Kim
Great UL leggings for winter trail running

Stretchy enough for trail running, warm with fleece backing. It indeed seems much more durable than Polartec Alpha 90 gsm, while being less breathable. That is fitting for high-exertion lower body wear during winter.

Actual weight on scale is 112g in Size M. The fit is loose compared to spandex-compression tights. What remains to be seen is if it is chafe-free enough on its own for long-distance running. Otherwise, you would add a boxer brief next to the skin, a combo that is still light compared to most long tights.

I favor no weight-adding features like pockets, as this is meant to be worn beneath shorts or pants during colder weather. I'm satisfied.

J
Jasper White
Fit is true

Fit nice! Looking forward to using them for cooler bike rides under my shorts this spring.

D
David
Product Exchange

I had to exchange my thermal leggings due to a stitching that came out.
They made the exchange easy and simple.
They gave me an option of sending them the return item OR ship the new item out first so I receive it quicker but gave me a couple of weeks to send back the old item before charging me for a full purchase.
I chose the second option and returned my leggings after receiving the new ones. I was able to reuse all the packaging that the new leggings came in so nothing was wasted, printed out the return label and dropped it off at the post office.

A
Anonymous
Comfortable and well made

Comfortable, well made, fit just as expected. Will be an excellent base layer while backpacking or trips to the snow.

S
Stephen Coad
Ultra Light And Comfortable

I've used these a lot, they are very lightweight and reasonably warm. They are comfortable enough to wear on cold nights to sleep warmer or under my hiking pants on a cold hike.

T
Toby Hill
These leggings are close to perfection

These leggings are close to perfection. Soft, breathable, and warm. Another item to add to my ever-growing list of outstanding and satisfied purchases from OV.

D
Danny Stephens
The highline thermal leggings are a great piece of gear

The highline thermal leggings are a great piece of gear. They are super lightweight and and comfortable. We’ll have to see how durable they are now.. So far I like them. Well done OV.
🦉

A
Anonymous
Worked as described

Worked as described. I wore them for 3 days straight. They kept me warm and never wet always dry. Only disappointed to find out it was just polyester and not some super new material.

D
David
Soft and Warm Great Leggings

These leggings are soft and keep me warm. Based on using them I would highly recommend them.

A
Anonymous
Pant or lng underwear?

Nice, lightweight, kind of like long underwear / base layer, no pockets). And no fly so they qualify as pants. They can serve two functions: base layer and spare pair of pants. Nice.

J
Jeff Stoops
Best leggings

Best leggings ever

C
Chsrles Cothran
Lightweight but Warm

Lightweight. Warm but airy.

J
J.D.

Very soft and ultralight. I could not find anything like it in the market. I always have it for my winter camps.

C
Carlos

I’ve had my eye on these for a while and I finally pulled the trigger and got them. Very happy that I did because I got them just in time for the big winter storms of 2026. Did I mention how light and warm they are? Great product.

J
Jacob Neathawk
High line leggings

These are warm and the fit is decent. I didn’t realize these don’t come with a fly. It’s super annoying to have to deal with this in cold temps with multiple layers on.

G
Gpack
Overall these are decent

Overall these are a decent base layer. Very warm, comfortable and extremely light. I took 1 star off because the first pair they sent me had a seam coming apart on the waistband when I took it out of the package. The ensuing return process has been a bit of a pain point, honestly, but it is what it is. But as for the pants, my only complaint is consistent with the damaged condition these pants arrived in- the fabric seems very delicate and prone to tears etc (as is the case with most ultralight gear). An extra ounce may be worth it to look for a more sturdy/better quality base layer, but overall I kept them and rated 4 stars because I am satisfied with them and will wear them.

M
Marshall
These leggings are fantastic

These leggings are fantastic. I wore these multiple nights in the teens with great success. Just what I was looking for. The meterial and feeling of the leggings is similar to the kuiu peleton 97 jacket. Hopefully OV will make a pullover jacket to match the leggings.

P
Patrick

Light but warm. Moisture wicking and dry fast!

E
E.J.

Very warm leggings. Seem durable.

T
Tom Muschlitz
Highline Thermal leggings

I received my leggings about two weeks ago. The weather in North Carolina is normally mild in December. However this year we had eight days of freezing weather with the lowest temperature of 14 degrees. I wore my Highline leggings and was very pleased with their performance. I might purchase another pair. Tom

M
M.M.

Very comfortable. So far just lounging around the house. Hopefully I will get some use out of them this weekend on my trip.

T
Terry Anderson
Warm and cozy!

These things were great kept me warm on my DGMBR ride.

K
Kristopher

First Impressions: Great! The length is good for me, i have a 34” inseam. They are plush on the inside and smooth on the outside, they are just wht Ive been looking for.

I got these to replace a pair of ZPacks Octa Fleece pants I returned because they were so short.

Havent used them yet in the feild, but I am pleased upon arrival!

L
Lara
Great warmth, but only one season?

I love these for warmth and used them for my sleep pants on my thru of JMT. Unfortunately, they got pin holes that got bigger over time, and there's now a big hole at the waist band, I followed all washing instructions. I really hoped they'd last longer than one season. Still...I'll wear them until they fall a part completely as the warmth to weight ratio is awesome.

J
John

Good fit

Z
Zig Peacock
Highline Leggings - light, warm, comfortable.

I have used these on several nights outdoors, ranging from low 30's to 40's. They are light weight and almost too warm in the mid 40's. The only two items that could be improved are a cell pocket and the fit is a little too low waist, making it an odd fit for my shape. It feel like it rides higher in the front, and almost gives me plumber crack in the back. Would love if they had a little higher rise.

S
Sean P Nelson
Warm, light, comfortable

Love these leggings.. Couldn't believe how lightweight they were and yet also nice and comfy and warm. Highly recommend!

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