These are the midweight base layer bottoms for your cold-weather adventures. The 250 Vertex Leggings Crystalline are made with incredibly soft, 100% merino wool in a comfortable and warm 250gm jacquard knit. They feel great next to your skin and the fabric is naturally breathable and odor-resistant to keep you in your comfort zone, wherever the trail takes you. They feature a gusseted design for unrestricted movement and are a good weight to layer under shell pants for the frostiest days. Flatlock seams prevent chafing on snowshoe hikes, backcountry ski tours and other active days in the cold.