Dr. Brown's Wide-Neck 100% Silicone Baby Bottle Sleeve is designed to protect Dr. Brown’s Options+ glass baby bottles from breakage. The fitted bottle sleeve ensures a good grip even if the bottle is slippery. Featuring a see-through back panel, it allows you to keep an eye on proper measurements. The glow-in-the-dark feature makes it easy to see during late-night feeds. It protects the bottle while in use, warming, or in the dishwasher. BPA Free, dishwasher and sterilizer safe.