Parents, these silicone sleeves for Dr. Brown 4 oz glass bottles are absolute lifesavers! You get two sleeves in the pack that fit snugly on those narrow Dr. Brown glass bottles (bottles not included, just the sleeves). The food-grade silicone is BPA-free, odorless, and completely non-toxic, which is so important for baby products. They provide awesome protection against breaks and chips if the bottle gets dropped - and let's be real, drops happen constantly with little ones. The square cutout design is genius because you can see the measurements clearly and even add powder or breast milk without removing the sleeve. The silicone material is soft and non-slip, making the bottles much easier to grip compared to slippery glass surfaces. They're super versatile too - dishwasher safe, microwave safe, and even freezer safe, handling temperatures from -104°F to 446°F. Installation is a breeze: just slide the top through the cutout and pull the sleeve down over the bottle. They're durable enough to withstand stretching from regular use without losing their shape. Whether you're at home, on the go, or dealing with middle-of-the-night feedings, these sleeves make handling glass bottles so much safer and more convenient. They're definitely one of those baby products you don't realize you need until you try them, and then you wonder how you ever managed without!