Columbia Women's Omni-Heat Vail Square Jacket-Black-XS 100% Polyester Omni-heat thermal insulation technology helps maintain warmth and prevent heat loss with the highest heat retention per gram in the industry Lightweight down alternative insulation combines with Omni-Heat thermal reflective lining for warmth without the bulk Water-resistant outer layer helps repel moisture and stains Attached scuba hood Elastic cuffs and hem