The Coolsport Vestino can be used for cooling during activities that would normally heat you up -- or it can be used for the therapeutic cooling of thoracic aches and pains. High tech textiles were chosen to provide maximum performance. Interior lining is waterproof. Exterior spacer knit insulates the removable CoolPaks, keeping them colder for longer than any other cooling garment. The fit of this sporty garment is "backpack style", meaning all the cooling power is targeted specifically down the spine. Hands-free cooling for sports, work, or pain relief.