evo.com | Burton Mid-Layer Bottoms > At first glance you'll think they're yoga pants, until you realize they're built for blizzards, not downward dog. The Burton AK Helium Stretch Insulated Pants are a lightweight, breathable mid-layer designed to slide effortlessly under your 3L shell or keep you cozy around base camp. With a seamless, yoga-inspired waistband and soft cuffs that shift up over boots, they deliver low-bulk warmth and all-day comfort whether you're skinning, riding, or just lounging after. Thermacore Stretch Insulation (40g) Offers superior warmth-to-weight performance in a low-bulk design that won't restrict your movement, providing insulation that is designed to move with you and uses bluesign(R) approved materials that are safe for people and the planet. Zippered Stash Pocket Zippered Handwarmer Pockets Regular FIt Stretchy and breathable technical mid-layer insulator pant intended to be worn under 3L shells or at base camp. Stretch Breathable Lightweight 20D Nylon / Spandex Plain Weave Water-Repellent Coated Fabric | Women's Burton AK Helium Stretch Insulated Pants 2026 - X-Large Black | Nylon/Spandex