The Rab Women's Powerstretch zip top is a fast wicking and quick drying Polartec Power Stretch top, designed for use as a midlayer or warm base layer.Features:Polartec Power Stretch fabric1 chest pocket w/YKK zipDeep front YKK zip for ventingMedium cut designHigh collarLong cut arms with thumb loopScooped hemFlat seams for added comfort and easy layeringWEIGHT 300gGlossary:Wick/Wicking:The act of transferring moisture from the skin to the outer layer of a garment quickly and efficiently, where it evaporates. Provides a drier more comfortable environment inside a piece of clothing/equipment. Polartec Power Stretch:Fleece fabric with added Lycra for 4-way stretch and maximum mobility. Its abrasion resistant face protects from wind, while the interior wicks moisture away from the skin.