Insulate and protect your baby's bottle with a Philips Avent Glass Bottle Sleeve. This soft polyester sleeve maintains a liquid's warm or cool temperature while also providing shock resistance for glass bottles. The convenient design features an opening that lets you see your bottle's scale. Available in two stylish colors: grey/vanilla trim and vanilla/blue trim. This sleeve fits 4-ounce Philips Avent Natural glass bottles (sold separately).