The Men's Oasis Long Sleeve Half Zip is the ultimate do-everything baselayer. Built from our 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. To ensure comfort on the move, the Oasis Long Sleeve Half Zip has offset shoulder seams, set-in sleeves and flatlock stitching throughout, plus a slightly longer bottom hem in back. It's a good thing merino resists odor so well, because you'll want to wear this shirt for every activity, day after day.