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A low-profile design that integrates under any Burton AK shell, the Burton AK Helium Insulated Jacket provides warmth in cold conditions without the extra bulkiness. PrimaLoft® insulation keeps you toasty even when wet and is engineered with extra loft in the sweet spots for maximum efficiency. This lightweight insulated jacket is built with buttery soft, water-repellent fabric to reduce layering friction and shed moisture when exposed to the elements. Integrated handwarmer pockets allow easy access through pit zips of AK shells. The AK Helium offers maximum warmth without restricting mobility and comfort.