Crafted for punishing ascents in intermittent weather, this adaptable, hardworking midlayer expertly manages your output, even when you’re adding and removing outer layers. Delivering the moisture control and temperature regulation you need when you’re working your hardest, this is breathable, wicking active insulation which works at the core of your layering system to keep you comfortable and sweat-free. Armed with an unbeatable fabric combination that breathes, traps warmth, and disperses moisture quickly, it’s an essential layer for your next bid for the summit.