Lightweight, all-season baselayer bottoms with a gusseted design and a touch of stretch, the 150 Zone Leggings offer breathable insulation and unrestricted range of motion on any day of the year. The Zone features our BodyfitZONE construction, which combines lightweight and stretchy corespun jersey with strategically placed merino mesh panels to help regulate temperature during stop-and-go days of skiing, climbing, running or cold-weather hiking. Our corespun fibers use nylon threads wrapped in soft merino wool and blended with Lycra for the ultimate combination of durability, stretch and next-to-skin softness. Flatlock stitching keeps these bottoms from chafing during day after day of dynamic motion.