The KYWIE insulated cases are made of sheepskin. As our beautiful wool sweater retains our body heat, a KYWIE case, in the same way, keeps a pre-chilled bottle cold for 4 hours. Production is carried out in Europe, reducing the ecological footprint to its strict minimum. The sheepskin used to produce the KYWIE insulated cases is a skin made from recovered scraps in order to be revalorized and made into natural, effective objects that do not participate in overproduction. 100% biodegradable. Maintains the bottles at a temperature of around 4 hours (hot or cold)