Cold mornings on the skin track call for a baselayer that disappears, and the Capilene Lightweight Crew Top does exactly that. The underarm gusset and set in seams move with every reach, letting the rest of the kit do its job without interference underneath. Minimal, low bulk seams reduce chafing over hours of movement, while matching fabric thumb loops keep sleeves anchored without adding bulk at the wrist. What Our Gearhead(R) Experts Are Saying:"I've worn this under a shell across back-to-back tours without a wash in between, and it still doesn't smell like the effort it's seen. I love that the odor-control tech is made from plants, not harsh chemicals. It wicks sweat fast enough on the climb that I'm not fighting a clammy layer on the way down."