Spring skiing or summer camping? The year-round Merino 150 Base Layer Long Sleeve is game for either. With our Core Spun technology, we&';ve wrapped lightweight Merino around a nylon core for added durability, while still keeping the comfort of ultra-soft, responsibly-sourced Merino next to skin. We added smooth flatlock seams to help minimize chafing and offset shoulder and side seams to lie smoothly beneath pack straps. Select colorways feature a more responsible plant-based-dye technique. No matter the season or the activity, this base layer is made for it. Benefits Core Spun Merino fibers wrapped around a nylon core for added durability while still keeping the comfort of Merino next to skin Merino 150 This breathable, soft, lightweight fabric offers next-to-skin comfort, moves sweat away from the body, and acts as a versatile performance layer for warmer conditions. Features -Slim Fit -Raglan sleeve design elimates need for shoulder seams -Flatlock seam construction designed to minimize chafing -Knit in Vietnam: 87% Merino Wool, 13% Nylon Core -Garment Weight: 170 g = 6 oz Care -Machine Wash Warm Gentle Cycle. -Do Not Iron Decorations. -Do Not Bleach -Tumble Dry Low -Cool Iron As Needed -Do Not Dry Clean -Wash With Like Colors