Problem: It's hard to stay hydrated in the sauna. Plastic bottles get melty and warm. Metal bottles get scalding hot to touch. Solution: The Sauna Bottle by Jarvi. We've developed a bottle that's cool to touch and keeps your water icy cold & plastic-free even in a 100° celsius sauna. The first water bottle designed for saunas - Icy cold water from a bottle that's cool to touch, even in a 90° celsius sauna. Our unique, natural Cork x Neoprene exterior remains cool to touch even in extreme heats. We've bonded beautiful natural cork on the outside with insulated neoprene on the inside to create the ultimate exterior for The Sauna Bottle. The result is a bottle that looks striking and natural while also being incredibly cool to touch in high heats. Keeps water icy cold, even in hot saunas. The bottle is constructed from insulated double-walled stainless steel with an air-tight bamboo lid.