The Women's Oasis Long Sleeve Half Zip is one of the most versatile baselayers in our collection. Made from our super-soft, breathable 200gm merino jersey fabric, Oasis keeps you warm in cool weather, breathes well in warm conditions, and only becomes softer with age. And the details are designed for movement, so it is an ideal baselayer under a top or shell, and great for wearing alone on a cool morning run or a hike in the mountains. Flatlock seams won't chaffe, a drop hem for more coverage, and set in sleeves keep it comfortable under a pack. If you get too hot, the half zip provides instant ventilation. And because it is merino, you can wear it several times between washings, odor free.