Proof
72-Hour Merino T-Shirt - Slim Fit
72-Hour Merino T-Shirt - Slim Fit
Story
The merino T-shirt, reinvented to help us go farther, pack lighter, and skip laundry for days
Our bestselling 72-Hour Tee is woven from a super-soft merino wool blend that harnesses the material's all-natural performance, while also offering long-lasting durability and machine-washable convenience. This high-performance shirt is built for everyday style, no-hassle travel, and casual days outdoors. Even after 72+ hours of constant wear, it’ll still look on-point and pass the "sniff test" thanks to the naturally odor-resistant and moisture-wicking properties. Our community has wear-tested these tees everywhere from the streets of Tokyo to the trails here in Austin, and we can’t wait to hear where you take yours.
Features
- Made from the world’s best merino wool
- Naturally moisture-wicking and temperature-regulating
- Odor-resistant for 72+ hours of non-stop wear
- Super-soft feel that’s never itchy
- Rated UPF 30+ for sun protection
- Woolmark certified for meeting the highest standards of quality, durability, and performance
Sizing
- The 72-Hour Merino T-Shirt has a slim 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 or check out the 72-Hour Merino T-Shirt - Classic Fit
- 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 the absolute best personal fit, compare your body measurements to the chart below
Body Measurements
| XS | S | M | L | XL | XXL | 3XL | |
|---|---|---|---|---|---|---|---|
| Chest | 35 - 36 | 37 - 38 | 39 - 40 | 40½ - 42 | 42½ - 44 | 45 - 47 | 48 - 50 |
| Waist | 26 - 28 | 28 - 30 | 30 - 32 | 32 - 34 | 34 - 36 | 36 - 38 | 38 - 40 |
| Garment Body Length | 26¾ | 27¼ | 28 | 28¾ | 29½ | 30½ | 31½ |
All measurements are in inches.
How to Measure
- Body Chest: use a flexible measuring tape to measure under your arms around the widest part of your chest
- Body Waist: bend side to side to find your natural waist and measure around that point
- Front Length: measure on a shirt from the high shoulder to the bottom hem
Materials & Care
- 87% 16.5 micron merino wool, 13% nylon, 150gsm
- Made in China and Indonesia with wool sourced from Australia and New Zealand
- Sourced from industry leader Indorama, the specialized merino/nylon blend used in the 72-Hour Collection is the cutting edge of technical fabrics that doesn’t sacrifice comfort for performance. It not only takes advantage of the amazing natural properties of wool, but strengthens them with nylon for a truly impressive fabric. Sustainably sourced.
- Machine wash cold on gentle with mild detergent; tumble dry low or air dry to avoid shrinkage; do not use softener or bleach
About the 72-Hour Collection
The team at PROOF created a performance tee that can be worn for 72 hours straight without showing any signs of wear—or, you know, odor. The 72-Hour Tee is built from the softest and strongest merino wool on the planet. To back up that claim, we’ve packed it 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, this temperature-regulating tee isn’t just for adventure, it’s also our all-time bestselling tee for everyday wear.
The Sweat Test Guarantee
Put your new Proof gear through its paces. If it does not meet your expectations, we'll accept your dirty laundry and issue a refund, no questions asked.
Terms and limitations here
