The Icebreaker Men's Oasis Long Sleeve Half Zip is the ultimate do-everything baselayer. Built from Icebreaker's soft, luxurious 200gm merino jersey fabric, Oasis keeps you warm in cool weather and breathes well as you heat up. And you can open the half zip for instant cooling on the fly. It's a good thing merino resists odor so well, because you'll want to wear this shirt for every activity, day after day. Features:Weight: 200 Lightweight Fit: Slim Softness, versatile warmth and breathability with instant ventilation, great fitZip neck collar for temperature regulation, set-in sleeves, offset shoulder seams prevent chafing, drop tail hem for added coverage Icebreaker Merino heat transfer logo Care: Machine wash. Dries fast in the shade, but do not tumble dry. Exact instructions on the care label. Fabric: 100% Merino wool See "Overview" below for