Zpacks Octa Fleece Thermal BottomsZpacks Octa Fleece Thermal Bottoms Zpacks Octa Fleece Thermal Bottoms set a new benchmark for warmth to weight performance in ultralight base layers. Designed for versatility, they work just as well under hiking pants in freezing conditions, under shorts on cool days, or as an ultralight sleep layer when every gram matters. Made from advanced 2. 35 oz sqyd Octa fleece, these thermal bottoms deliver exceptional insulation at a fraction of the weight of
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