Safe & Soft Silicone Material: Made from 100% food-grade silicone, these bottle sleeves are BPA-free and chemical-free, ensuring maximum safety for your baby. Unlike other silicone products, they resist dust and hair, promoting better hygiene for infants. Ultimate Protection & Durability: Designed to protect against bumps, drops, and scratches, these silicone sleeves are essential for families using glass bottles. The durable, flexible material minimizes the risk of breakage, making feeding time stress-free and worry-free. Thermal Insulation & Comfortable Grip: The sleeves insulate glass bottles, retaining milk temperature longer and making removal from heaters or sterilizers safe and convenient. The textured surface also ensures a secure grip for both parents and babies, encouraging independent feeding. Practical Cutout Design: The thoughtfully placed cutout ensures visibility of the bottle’s measurement markings, making it easy to prepare milk and monitor consumption without removing the sleeve. Easy to Clean & Compatible: Heat-resistant silicone makes these sleeves dishwasher-safe, sterilizer-safe, and simple to clean after use. Specifically designed for Philips Avent Natural Glass Baby Bottles (4 oz), other series are not applicable. PandaEar 3 Pack Silicone Sleeves are specially designed for Philips Avent Natural Glass Baby Bottles (4 oz), offering a perfect combination of safety, protection, and convenience. Made from 100% food-grade silicone, these BPA-free sleeves ensure your baby's health while providing excellent protection against bumps, scratches, and breakage. The thermal insulation feature helps maintain milk temperature and allows for safe handling straight from heaters or sterilizers. With a practical cutout design, parents can easily monitor milk levels, while the soft texture offers a secure grip, encouraging independent feeding for babies. Easy to clean and highly durable, these sleeves are dishwasher and sterilizer-safe, making them a must-have accessory for families using glass bottles.