The Icebreaker Women's 250 Vertex LS Half Zip Top/Crystalline is a snazzy baselayer top for cold-weather activities. Made with 250-weight 100% Merino wool, it offers midweight warmth that's soft on the skin and naturally odor-resistant. The Slim Fit helps keep moisture off the skin and prevent bunching while layering, and the 1/2 zip makes it easy to cool off if you build up some steam out there. Features of the Icebreaker Women's 250 Vertex Long Sleeve Half Zip Top/Crystalline Zip neck collar for temperature regulation Offset shoulder seams prevent pack rub Forward side seams for comfort Underarm gusset for comfort and mobility Drop tail hem for added coverage Fabric Details 100% Merino