Food-Safe Soft Silicone: Silicone Baby Bottle Sleeves is made of food grade silicone, BPA free, no chemical additives, which is safe to use. And did not catch hair as much as some other silicone products, helpful for infant hygiene. Provides Excellent Protection: Against bumps and scratches. These are a must for anyone using glass bottles. They provide a more sturdy protection to keep the bottle from breaking if dropped, and also make it easier to grip and hold. Thermal Insulation: Silicone baby bottle holder also help insulate the glass bottle, facilitate removal from in the heater, and maintain the temperature of the milk longer than if the bottle was sleeveless. comfortably Feeding: Super nice silicone sleeve for bottles help soften the grip for mom and also helps baby hold the bottle when it comes time for them to hold it themselves comes in cute colors and an adorable little cut out so that you can keep an eye on the amount of milk left.