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All-mountain attire is available in excess, but nothing compares to a midweight performance fleece like the Burton AK Helium Power Grid Pullover Fleece Jacket, which is designed for active or casual winter pursuits. As a no-frills pullover jacket, the AK Helium features a matrix of grid and hard fleece to create warmth where you need it and breathability where you want it; the minimalist design reduces mass and maximizes overall performance.