Tern Ultralight Merino Wool Tee

New Poly Blend fabric will dry faster & retain shape even better than original nylon fabric blend

The Tern Ultralight Merino Wool Tee is engineered for optimal moisture-wicking, comfort, sun protection, and quick-drying performance while managing odor & bacteria buildup. 

  • Moisture Management: Experience excellent moisture-wicking capabilities, allowing the merino wool blend to effectively draw moisture away from your body while retaining its shape exceptionally well. Ideal for both hot weather and as a base layer in cold temperatures. 
  • Comfortable Fit: The athletic fit of the Tern ensures comfort without being tight or restrictive. This design enhances the merino wool's moisture-wicking properties. With no hardware, simplicity reigns, contributing to decreased weight for high activity.
  • Odor and Bacteria Resistance: Benefit from the natural odor-resistant properties of merino wool, making the Tern perfect for travel, running, hiking, and everyday use. The ultralight weight adds to its versatility.
  • Better Shape Retention: the new Poly blend Tern fabric holds its shape exceptionally well for merino wool, even when wet.  It will stretch sufficiently without “bagging out” & becoming shapeless. 
  • Faster Dry Times: the Tern dries faster than typical merino wool blends.  This gives you better performance in high-output activities & will help you regulate your temperature better.

The natural odor resistant & ultralight properties of merino wool make the shirt perfect for travel, running, hiking, and everyday use.

The fit should be athletic, but not tight or restrictive- this allows the merino wool blend to more effectively wick moisture from your body.  There is no hardware, adding to the simplicity and decreasing weight.  The Tern is a high performance piece for high activity.

Whether shielding yourself from the sun on warm days or using it as a base layer for colder temperatures, the Tern Ultralight Merino Wool Tee offers unmatched performance. Elevate your outdoor experiences with a shirt that adapts to your lifestyle.


Tee (Men's L): 4.1 oz


True Flat-Lock Seams

Raglan Sleeves

Excellent Stretch

Moisture Wicking

Bacteria/Odor Resistant

Quick Drying

Athletic Fit for Baselayer or Stand-Alone Layer

Holds Shape (even when wet)

UPF Rating 36+

Farm to fabric RWS (Responsible Wool Standard) certified wool by NuYarn™


  • NEW Poly Blend Fabric: 115 GSM Merino Wool blend - 63% merino (18 micron), 29% polyester, 8% nylon, knit
  • Original Nylon Blend Fabric: 115 GSM Merino Wool blend - 58% merino (18 micron), 42% nylon, knit
  • Fit: Close
  • The Tern Tee should fit close to skin and fit easily beneath other layers.
  • Gender: Men's sizing
  • PFAS free

Care: This product is built for ultralight performance, & was not built to withstand abrasion.

Do not wash in a machine that has an agitator. Use mild detergent on a delicate cycle with cold water. Hang dry.

Note: If used with a backpack, some pilling may occur. Pilling will not affect performance, & is not covered under warranty.

Warranty: Outdoor Vitals Performance Promise


Layering Collection: Kinetic

Layering Category: Moving Set or Baselayers

Product Care

Your Tern Ultralight Merino Wool apparel is a high performance piece of gear. It needs some extra attention to keep it performing at the highest level.

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

Before Washing

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

The Wash & Dry Process

  1. Use a mild detergent like Dreft (for babies) or Nikwax (for technical gear).
  2. Choose Low Spin or Delicate wash.
  3. Choose Cold Wash & Cold Rinse (add extra rinse if possible).
  4. Hang dry until the product is completely dry.

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


Nuyarn® Technology

Outdoor vitals uses Nuyarn­­® Technology in all of our merino wool fabrics & apparel. Nuyarn is a spinning technology that releases the natural performance characteristics of wool fiber that are otherwise twisted out by traditional wool spinning methods. 

Essentially the result is performance products made from natural fibers that can outperform synthetics. 

Nuyarn® can make wook that performs as closely as possible to the way it does in nature, to rival or exceed the performance of synthetic alternatives. 

Types of Spinning

 Ring Spun & Traditional Core Spun techniques compress the natural air pockets in the fiber, create loops, & restrict the natural movement of the fibers -essentially creating a rope-like structure that can be itchy next to skin. 

Nuyarn® does not twist the fibers. Instead it drafts merino fibers along a high performance filament, resulting in 2 ply yarns with much more volume & aeration.  (This 2 ply yarn structure is 35% finer than yarns spun on a conventional ring frame. Combined with the Nuyarn® thermal advantage, this offers the capacity to engineer much lighter, high performance fabrics as a result.)

Benefit Summary

The Nuyarn® method of twist-free spinning allows us to create products that outperform traditional merino wool & synthetics, and offer a natural enhancer to athletic performance. 

  • 5x Faster Drying
  • 85% More Elasticity
  • 120% More Seam Strength
  • 53% More Air Resistant
  • 30% Less Resources Used
  • 8.8x More Durable
  • 35% More Thermal Retention
  • 50% More Burst Strength
  • 25% Less Energy Used


Lighter Weight, Higher Performance

Compared to traditional merino wool, Nuyarn® wool is:

  • 5x Faster Drying
  • 85% More Elastic
  • 8x More Durable
  • Uses 30% Less Resources

"Twist-Free" Spinning

Made with Nuyarn® Spinning Technology

Nuyarn's proprietary spinning technology produces a much lighter & higher performance wool fabric

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Customer Reviews

Based on 43 reviews
Matthew Gravier
A good base layer

I bought the original term sun hoodie when it came out and liked it but thought it would make a much better short sleeve tee. I was right. This tee does everything you need it to as a baselayer. It wicks sweat and dries quickly, do you need it to do anything else?

Mark Milhollen

Great shirt for the heat

Tyler Campbell
I dig the new fabric

I recently picked up the new Tern tee and hoodie. I liked the old fabric, but must say that I like the new fabric better. Very comfortable and better at holding it's shape

Greg Clark
Ultralight shirt

They suck, didn’t have one on for 4 hours, did run anything but a chair, and the shirt split a hole in my belly area. I will not buy again.

Terry Anderson
My favorite merino shirt

I got this because I love my OV Merino Wool sun hoodie. This did not disappoint. Soft adsorbant and doesn't stink after days of use.