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W's Runterra Bio Muscle Tank

biodegradable, comfortable, active performance
$36 $52

15 reviews

Run in it, sweat in it, live in it — then biodegrade it!

The first synthetic-blend running shirt that biodegrades like a 100% cotton tee, our Runterra Bio offers the enhanced moisture and odor control of specially-formulated 37.5® polyester with the comfort and versatility of cotton. This innovative fabric breaks down into organic compounds in as few as four years. Conventional polyester takes up to four hundred.

Don’t sweat it — this tee will only start to biodegrade in anaerobic (oxygen-poor) environments. It breaks down in the landfill, not in your closet.

Color: Seek New Blossom
Size
Features

Biodegradable
Runterra Bio is powered by a specially formulated 37.5® polyester with enhanced biodegradation to break down into bio-based compounds in as few as 4 years in an oxygen-poor environment like a landfill

Premium cotton
Made from long staple, US-grown Supima® cotton for superior softness, strength + durability

Everyday looks
Easy to wear, slightly cropped silhouette hits above hip

Active comfort
Blended with 37.5® polyester, a special technology utilizing the natural benefits of microscopic volcanic ash to provide enhanced thermal, vapor + odor regulation to maintain body comfort during activity

Wear more, wash less
The natural odor resistance of cotton is boosted by the volcanic particles which "trap" odors so you can put this top through repeated wear

Modified raglan design
Shoulder seams are rolled back off the top of the shoulders for ergonomic comfort

Shrinkage is natural
This top is made from 70% natural fibers and is not pre-shrunk so some shrinkage may occur, up to half a size
Materials + Specs

Runterra
70% Supima® cotton, 30% 37.5® tech polyester

Garment made in Vietnam

Weight
103g / 2.6oz (W’s Small)
View details

Customer Reviews

Based on 15 reviews
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D
Devin M.
Wear it for: Running
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: XS
Size Purchased: XS
Running tank

I wear xs I am 5’1 around 115lbs. Nice tank will wear it when it gets a little bit cooler. I only jog in sports bra in the summer heat no shirt.

J
Jackie L.
Wear it for: Running
Product Fit: Runs large
Height: 5'0" or shorter
Usual Size: S
Size Purchased: S
Great for Running

I loved this muscle tank; super comfortable and light, plus no chaffing. I got the S, but the XS would probably have been a better fit. I highly recommend it.

N
Nancy C.
Wear it for: Running, Hiking, Everyday wear
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S

Fabulous tank for running. Lightweight, doesn’t chaff, and the box fit lets air circulate. Nicely stink resistant. I went to buy more, but they were all sold out. Hopefully more next summer.

P
Pamela
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Great top for the summer

I love the simplicity of this top. It's loose, comfortable, and great in hot weather!

K
Kayla B.
Wear it for: Hiking, Everyday wear
Product Fit: Runs large
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: XS
Cute & comfy

Bought this primarily just for everyday wear. It’s really comfortable and light! I typically wear a small in most clothes but based on the way it looked on the model i ordered an extra small and it fits as pictured!

V
Vanessa
Wear it for: Hiking, Camping, Cycling, Mountain Biking, Everyday wear
Product Fit: Runs large
Height: 5'10" to 6'0"
Usual Size: S
Size Purchased: XS
Perfect top for cycling or post run

Super soft, great design, excellent message. Super cute boxy and slightly cropped fit. I like these and the tee--I size up in the tee for an oversized look.

R
Rene R.
Wear it for: Everyday wear
Product Fit: Spot-on
Height: 5'1" to 5'3"
Usual Size: S
Size Purchased: S
My new favorite top

I LOVE this top! I wear it woth jeans or my favorite casual shorts. It looks great and, quite honestly, it makes me happy!

M
M.H.
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: XS
Size Purchased: XS

Love this shirt! Fits great and the design is super fun!

A
A C.
Wear it for: Running, Everyday wear
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
Love it

This is one of my new favorite pieces. It’s great for days where it’s too cold for a running crop top or light tank top, but too warm for a full t-shirt or long sleeve shirt. I like that it balances feeling soft, with being breathable. The loose fit helps air flow to keep cool as you heat up during a run. When I ordered I measured myself to see where the hem would hit, but because the shoulder seam sits back farther my measurement was off and it was a bit shorter than I expected. Not an issue, just something to be mindful of. I will likely order another color, as I also like lounging around the house and yard in it.

M
Malia W.
Wear it for: Running
Product Fit: Spot-on
Height: 5'4" to 5'6"
Usual Size: S
Size Purchased: S
Comfortable

This tank has become my new favorite for runs. It is comfortable and fits well.

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