Food Grade Silicone:BPA free,soft and elastic,easy to put on and off,not catch of hair,helpful for infant hygiene  Against bumps:Silicone sleeves for Avent Baby Bottles can against drop down,bumps and scratches  Comfortably Feeding:Silicone sleeve Helps to prevent heat transfer,easy to grip,keep the milk warm  Unique design:Will not block the scale line, easy to check the remaining milk volume  Convenient And Easy To Clean:Simply put it in the dishwasher or boil it in water to clean it  Package includes 4 silicone bottle sleeves: 8 oz for blue and green, 4 oz for gray and white.  100% Satisfaction Guarantee! as a responsible seller, we are confident of our product,if you are unsatisfied or have any issues, just contact us and we'll take care of everything for you!  The right size and flexible silicone allows it to fit snugly around the bottle, preventing it from falling and rolling.