Ventilation Where it's Needed Most The Women's Ventro Jacket has the highest warmth-to-breathability ratio using award-winning Clo(R) Eco Vivo insulation, a breathable liner, and perforated materials in high-sweat areas. Built in and stowable Flip Mitts(TM) are also included for all-around best protection during extreme weather. Features Breathable insulation, liner and face fabric are combined for the most breathable insulator Award-winning Clo(R) Eco Vivo insulation increases breathability by 30% without sacrificing warmth and is made with 90% recycled fibers Perforated back panel and underarm panels provide ventilation where it's needed most, while maintaining wind protection in the front Stowable Flip Mitts(TM) at sleeves protect hands during extreme temperatures Grid fleece stretch panels at underarms and sides increase mobility and breathability Specifications Weight: 286 g / 10 oz Materials Shell: 100% polyester Liner: Perforated polyester woven | Ultimate Direction Women's Ventro Jacket Size Small