We're giving our staff time off before the holiday rush. Orders placed after 10/19 will ship 10/27.


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We're giving the Cloudline team time off before the holiday rush – New Orders will ship 10/27

Men's Merino Base Layer Short Sleeve

Size Guide

Why You'll Love This Shirt

Your biggest adventures require ultimate comfort — so you can push your limits in any conditions. Our versatile short sleeve Merino Base Layer features lightweight, wicking fabric that suits all kinds of adventures. Reach new heights, bag new peaks, and hike new trails — all in the comfort of our best merino wool.

Free Shipping & Returns in the USA

Covered by Our Hassle-Free Lifetime Guarantee

CloudLine socks are backed by a hassle-free lifetime guarantee and made in America

Every base layer we make is made in the USA and backed by a hassle-free lifetime guarantee. If there is ever an issue we’ll replace it. No hassles, conditions or strings attached.

Base Layer Features

  • Stay cool and dry during your most rugged treks. Our ethically sourced merino wool wicks your sweat and keeps you comfortable prime performance.
  • This shirt isn’t just soft, it’s also durable for your active lifestyle. The slim, athletic fit makes this the most comfortable — and tough — shirt in your kit.
  • Just because you’ve pushed your physical limits on the trail doesn’t mean you have to smell like it. Our naturally odor resistant merino wool keeps things fresh for those big days, long treks, and multi-day expeditions.
  • Flatlock stitching ensures this shirt sits comfortably under your pack for a smooth, seamless feel.
  • Throw this shirt in your carry-on or stuff it into your pack for an extra layer — high quality merino fibers naturally release wrinkles when worn so your shirt looks as fresh as it feels and smells.

Base Layer Specs

  • Men's Slim Fit: an athletic fit that moves with you.
  • 150 Ultralight fabric: 150 gsm merino fabric — knit from ultra-fine merino around a nylon core for the perfect balance of softness, fit, and durability with 87% merino wool, 13% nylon.
  • Garment Weight: 157 g / 5.6 oz.
  • American Made: We are proud to make our base layers in the USA from imported fabric.
  • Easy Care: Machine wash warm on gentle cycle. Do not bleach or dry clean. Tumble dry low or hang dry. Cool iron only.
  • Lifetime Guarantee: Backed by our Hassle-Free Lifetime Guarantee, It really covers it all.

Feel the Difference of High Performance Merino Wool