Helps Keep Liquids Warm or Cool Helps Insulate Protect Protect Your Glass Bottles Know When Baby is Done Feeding The Philips Avent glass bottle sleeve is ideal for protecting your glass feeding bottles and is specially designed to keep liquids either warm or cool. Due to the convenient opening, you can easily read the scale. Insulating material keeps feed warm or cool. Shock resistant material. Easily read the scale of the glass bottle. Washable at 40C. Oeko-Tex Class 1 certified - safe for baby. Fits 4 oz 120 ml Philips Avent Natural glass bottles. Available in vanilla grey and blue vanilla. Development stages: 0 - 6 months. Shock resistant. ;