The Absolute Zero Pants were carefully designed by guides and mountain athletes to protect expedition participants from the most unfavorable conditions that they may encounter at their destination. 800-fill goose down insulation and welded baffle construction maximizes body heat retention. Reinforced panels on the seat and knees provide durability when navigating exposed ridges and steep slopes with razor-sharp slate or granite. The insulation inside the trousers is RDS certified and does not contain fluorine Allied Down - the most responsible down insulation currently available by modern standards.