👶Perfect Compatibility: Designed to fit Avent natural glass bottles perfectly. Compatible with multiple size such as 4 OZ, 8 OZ, including larger 9-ounce bottles. 👩‍🍼Convenient and Easy to Use: Effortless to put on and take off without being too tight or loose. Dishwasher safe for easy cleaning and suitable for daily use with good durability. 👨‍🍼Enhanced Safety and Protection: Made from BPA-free silicone, these sleeves provide non-slip and drop protection, reducing the risk of breakage while adding extra grip to glass bottles. 🍼Stylish and Functional Design: Available in various cute colors with small mountain cut-out designs. Features viewing windows for easy visibility of bottle measurements, ensuring accurate dosing. 💑Thermal Insulation: The silicone baby bottle holder helps insulate the glass bottle, making it easier to remove from the heater and keeping the milk warm for longer compared to using a bottle without a sleeve. Tip: This baby bottle holder is compatible with Philips AVENT Glass Natural Baby Bottle 4 oz/8OZ, (other series are not applicable)