72-Hour Merino UPF Long Sleeve T-Shirt

Story

A long-sleeve tee that harnesses the power of merino wool

We call it the "72-Hour Collection" because every piece is spun from merino wool that naturally provides comfort, durability, and odor-resistance through three days of nonstop wear. Gearing up for an off-grid camping trip? Use this 72-Hour Merino UPF Long-Sleeve Shirt as a base layer—the merino wool fabric naturally wicks moisture and resists odors to keep you comfy from Point A to Point B. Spending a day on the water? Wear it solo—merino wool shields your skin from the sun’s harmful UV rays, and it’ll keep you warm when temps drop at twilight. Better yet, the merino is blended with nylon for superior durability, machine-washable convenience, and an itch-free feel.

Features

• Engineered fabric harnesses the natural properties of merino wool to wick moisture, resist odors, and regulate temperature
• Rated UPF 50+ for sun protection
• Lightweight design is just a little thicker than a regular t-shirt
• Nylon reinforcement allows the merino fabric to be machine washed while retaining its shape for easy care throughout the life of the garment
• Thumb loops keep the sleeves in place
• Slight curved hem adds a refined, stylish touch

Materials

• 84% 18.5-micron merino wool, 12% nylon, 4% spandex, 180gsm
• 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.

Sizing

• The 72-Hour Merino UPF Long Sleeve T-Shirt has a standard fit that's true to size, take your normal size in shirts
• For an ideal fit, compare your best-fitting long sleeve shirt to the size chart below

Garment Measurements

	S	M	L	XL	XXL
Front Body Length	27⅝	28⅛	28⅞	29⅝	30⅜
Across Chest	19½	20½	21¾	23	24½
Shoulder Width	16⅝	17⅛	17¾	18⅜	19⅛
Sleeve Length (Center Back to Cuff Opening)	35	35¾	36¼	37	37½
Neck Width (Seam to Seam)	7⅛	7⅜	7⅝	7⅞	8⅛

All measurements are in inches

Care

• Machine wash cold
• Tumble dry low
• Do not bleach

About 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.