Alpine winter cold is ruthless. The Alpha Insulated Pant – our warmest down-insulated pant – keeps you comfortable so you can stay on task. RDS-certified 850-fill goose down’s outstanding warmth is complemented with mapped synthetic insulation in moisture-prone areas. Exceptionally breathable 2L GORE-TEX INFINIUM™ with our proprietary ultralight, ultra-durable Hadron® face fabric blocks wind and resists water. Full-length side zips make them easy to pull on over winter climbing gear, and the articulated design fits comfortably and frees you to move.