What Our Gearhead(R) Experts Are Saying:"The internal suspender system keeps the suit in place as I move, and the oxygen mask-compatible collar means I'm not fighting my kit at altitude when I need to focus."Why We Like ItThe Absolute Zero Suit runs on 800-fill RDS-certified down in a box wall baffle construction that keeps insulation lofted evenly across the suit and prevents cold spots at the seams. Pertex 50D reinforced panels at the elbows, knees, seat, and hem add durability exactly where a climbing suit takes the most abuse. The extended underarm vent zippers give us a fast way to dump heat on a steep approach before the temperature drops on the summit ridge.