Designed to curve around the entire shoulder *13  x 16  fabric holster with removable elastic straps holds two 6  x 12  E*Packs * Pack stays flexible when fully frozen* Pack quickly reaches freezing temperature * Pack maintains low temperature longer * Pack has non-toxic fill enclosed in latex-free vinyl *Fabric cover retains cold longer and protects skin from tissue damage  * Cover has Comfort-Flex design shapes to your body * Cover has foam cushion  * Cover prevents condensation from wetting the skin or clothing * Cover is fully removable  can be machine washed *