HEALTHY AND FLEXIBLE, protects the bottle cap from mechanical impurities, the only one on the market made of a unique medical type of polypropylene, completely flexible with a specially doubled cap attachment to prevent cracking, with ergonomic design allowing natural grip and handling of the cap, in 5 color variants - clear, blue, green, pink, anthracite, dishwasher safe, certified for boiling at 100 ° C for 5 min.