What Our Gearhead(R) Experts Are Saying: "I use this as my go-to midlayer for cold starts and high-output climbs. It breathes incredibly well, stretches easily when I'm reaching or skinning, and fits cleanly under a shell or helmet. It's warm for the weight and never feels restrictive." We rely on the Taiss ML Hooded Jacket when movement, breathability, and reliable warmth matter most. Whether we're pushing uphill at altitude or transitioning between climbing and descending, this midlayer keeps our temperature balanced without overheating. Mammut designed it to move with us, making it a dependable layer for year-round mountain pursuits. Built with Polartec Power Stretch fleece, the fabric offers an excellent warmth-to-weight ratio while wicking moisture and drying quickly once the pace slows. The fitted hood layers comfortably under a helmet for added insulation, while thumb loops and flat seams keep everything locked in place without chafing. Harness-compatible pockets and underarm gussets round out a technical midlayer that's ready for long days and changing conditions.