The Evolver EXTEN Bottom from BlackStrap is a heavyweight baselayer pant built for uncompromising mountain performance. Crafted with their premium EXTEN fabric, it features a brushed, four-way stretch surface that moves with you while providing breathable warmth, quick-drying moisture control, and a plush next-to-skin feel. Designed with a tailored, regular fit and a secure waistband, this pant delivers excellent layering comfort. Plus, it includes odor-resistant construction and UPF 50+ sun protection to keep you fresh and shielded on long exposure days. Ideal for ski touring, cold-weather hiking, or multi-day backcountry missions, the Evolver EXTEN Bottom offers the thermal regulation and mobility you need in serious alpine conditions.