Soft, stretchy, and breathable yet with a nice substantial feel this has raglan sleeve shaping and for motion that moves with you without building up a static charge that causes layers to stick to each other this is the go-to baselayer for layering. With thumbholes at the cuff for smooth layering, slide the The North Face Summit Pro 200 Men's Crew under your midlayer, or the FUTUREFLEECE Men's Crew, the engineered holes in the face fabric will keep moisture moving quickly and efficiently so you stay comfortably dry and warm. Merrow, or narrow flat seams, give this wear strength and minimize chaffing for a baselayer you can comfortably wear with packs, and in multiple ways. And pack friendly raglan sleeves and underarm gussets mean you can reach, stretch, climb, and bend without pulling or snagging. This is a slim fit, as you’d expect with a baselayer. If you like more room or a more generous drape, size up!