The Dr. Brown's Natural Flow Options+ Glass Baby Bottle Sleeve Bundle includes 8 oz and 4 oz silicone sleeves to protect your glass baby bottles. The BPA-free, 100% silicone sleeves easily stretch over Dr. Brown's glass bottles, providing a grippy, protective barrier against breakage during use, cleaning, and storage. Their glow-in-the-dark feature allows for easy late-night feeding. The fitted sleeves have a transparent back panel to view bottle measurements when feeding without removing. Both sleeve sizes feature durable, flexible silicone that withstands stretching and distortion from repeated use. The bundle covers Dr. Brown's 4 oz and 8 oz glass bottles. The soft silicone material enables a non-slip grip while making bottles safe for babies. The removable sleeves conveniently clean alongside glass bottles – in the dishwasher, boiling water, or sterilizers – without needing to be taken off. Complementary sizes handle feeding needs as babies grow for a complete bottle protection solution.