72-Hour Merino Long Sleeve T-Shirt

Story

Merino wool long sleeve tee that never itches and stays fresh—no matter the mileage

Our bestselling 72-Hour Merino Long Sleeve T-Shirt is crafted from merino wool with a nylon core, which means because of its naturally odor-resistant properties, you don’t have to think twice about tossing it in the washing machine after one workout. Even after three days of constant wear, this shirt still passes the smell test, thanks to the natural moisture-wickin, temp-regulating properties of Merino wool. It’s the ultimate travel shirt in our arsenal, and it does just as well as a base layer as it does on its own as a casual long sleeve t-shirt—perfect for adventures that call for packing light and staying comfortable.

Features

• Engineered fabric harnesses the natural properties of merino wool to wick moisture, resist odors, and regulate temperature
• Nylon reinforcement allows the merino fabric to be machine washed for easy care throughout the life of the garment—just stick with cold/gentle washing to avoid shrinking
• Rated UPF 30+ for sun protection

Materials

• 87% merino wool, 13% nylon
• 16.5-micron yarn, 150 gsm
• Made in China

Sizing

• The 72-Hour Merino Long Sleeve T-Shirt has a slim, performance fit through the chest and body
• If you're looking for a looser or more casual fit, size up from your usual t-shirt size
• Wool-based products will shrink slightly in a conventional washer and dryer, so we recommend either cold/gentle washing and air drying, or taking the next size up to compensate
• For an ideal fit, compare your best-fitting long sleeve shirt to the size chart below

Garment Measurements

	XS	S	M	L	XL	XXL
Chest	36½	38½	40½	43	45½	48½
Shoulder Width	16	16½	17	17⅝	18¼	19
Front Body Length	27	27¾	28¼	29	29¾	30½
Sleeve Length	33¼	33¾	34½	35	35¾	36¼

All measurements are in inches

How to Measure

• Garment Chest: measure on a flat shirt from side to side starting 1” under the armpit, multiply by 2
• Shoulder Width: measure on a shirt straight across the shoulder from seam to seam
• Body Length: measure on a shirt from the high shoulder to the bottom hem
• Sleeve Length: measure on a shirt from the center back to the cuff opening

Care

• Machine wash cold on gentle cycle
• Tumble dry low or air dry to avoid any shrinkage
• Use delicate/mild detergent
• Do not use softener
• Do not bleach

About the 72-Hour Collection

The team at Proof created a collection of performance shirts that can be worn for 72 hours straight without showing any signs of wear—or, you know, odor. The 72-Hour collection is built from the softest and strongest merino wool on the planet. To back up that claim, we’ve packed a merino wool layer as our only shirt on demanding excursions around the world—from Iceland and the Swiss Alps, to Mexico City and even our own backyards. Turns out, these temperature-regulating styles aren't just for travel, they're also our all-time bestsellers for everyday wear.

About PROOF

Sprint and catch that train. Bike to your next meeting. Stretch out on that international flight. Thanks to innovative technical fabrics and thoughtful design, Proof’s smart, technical apparel rises to every occasion. Designed for work, play, and travel, Proof updates everyday essentials with the latest performance fabrics and construction techniques to help you get more out of your clothing—so you can get more out of yourself.