The Polar Skin C2E Ice Pack Bundle consists of four (4) specially-sized Comfort Gel Packs encased in Polar Skin Mini-Mesh sleeves saturated with ArcticAqua. Unique to C2E Ice Packs, Polar Skin Mini-Mesh sleeves form an air-permeable layer that allows for the movement of air and water vapor necessary for convective and evaporative cooling. C2E Ice Packs are intended for use in the high blood flow regions of the groin and underarms.