Koozies or can cooler; a neoprene based product. A produkt what is also used in wetsuites of divers and kite-surfers. This material has an isolation abbility and there for the cold or warm contence of a soda can, small bottle or coffee increases up to 40% ! No more wet fingers. After using this can cooler just fold and put in your jacket for the next time. No need to leave it in the fridge or vrieser. Perfect in use!