The i3 is a high performance midlayer or extreme baselayer for use in cold conditions. The athletic fit and flat-knit face make it ideal for use beneath mid or outer layers. Made from our four-way stretch fabric, the i3 is wind-resistant, highly breathable and has a great warmth to weight ratio. Features: Quick drying soft thermal stretch microfleece, Lightweight and low bulk, Elasticized waist, Lycra binding on cuffs.