The Kari Traa Smekker Half-Zip is a lightweight, 100% Merino wool women's baselayer top. Naturally breathable and odor-resistant, wool keeps you warm whether it's wet or dry and feels great against your skin. Flatlock seams turn up the comfort level when you turn up the heat. And if things get too hot, you can zip down the high collar. Panels of Jacquard-knit patterns in different intensities create flattering lines.