What makes it perfect is its superior Portugal make and high quality polyester material. With this sleeve on, you won’t have to worry about your glass bottle anymore since it provides shock resistance. It also has an insulating quality that maintains the temperature of your baby’s feed. Cleaning and maintaining this sleeve is easy because it is machine washable.What's more! The sleeve is BPA free and has been Class 1 certified by Oeko Tex and is baby safe.