If you're using Philips Avent natural glass baby bottles, these silicone sleeves are an absolute must-have! They're designed specifically for the 4oz Avent glass bottles and provide amazing protection against drops and bumps. Made from food-grade silicone that's BPA-free and completely safe for your baby, these sleeves wrap around the entire bottle to create a protective barrier. Even if the bottle gets dropped (because let's be real, that happens), the sleeve helps prevent breakage and scratches. But that's not all - they also provide thermal insulation to help keep milk at the right temperature longer, and they make the bottles much easier to grip with their textured surface and handy handles. Cleaning is a breeze too - they're dishwasher safe, sterilizable, and quick-drying. The package comes with three sleeves, which is perfect for having multiple bottles protected and ready to go. They don't stick to dust or hair either, which is great for keeping things hygienic. Honestly, these little sleeves give you so much peace of mind when using glass bottles with your little one.