Icebreaker Vertex Top - Women's: Our midweight Women's Vertex Top is made for active sports in cold weather. Using our soft, warm 260gm merino jersey fabric, we've built it for movement. The fabric is warm yet breathable, and resists odor naturally, so the Vertex Top is great as a cold weather running top or skiing baselayer, and you can wear it several times between washing. 100% Merino wool Warm, Breathable, sport versatility, Odor Resistant.