NurturePure Silicone Bottle Sleeves (for 8 oz NurturePure Glass Bottle). NurturePureTM Silicone Bottle Sleeves cover and cushion glass baby bottles to prevent breakage. Our innovative silicone bottle sleeves are made of safe, food-grade silicone of the highest quality. Our patent-pending design offers: *Break resistant protection *Air-cushioning *Roll reduction *Anti-skid surface *Soft and easy Grip *Thermal insulation. We recommend using the Silicone Bottle Sleeves with NurturePure brand glass baby bottles. Experts recommend feeding your child using our NurturePure Glass Baby Bottles which are: *Bisphenol A Free *Phthalate Free *PC and PVC Free *Chemical Toxin Free *Allergen Free.