The bottle is covered with a modern silicone sleeve that will help protect the bottle from breakage and also prevent bumping into other articles in your diaper bag. This silicone sleeve is free of plastics and is 100% non-toxic. The bottle and the sleeve can be boiled or put in the dishwasher together. The silicone nipple is latex-free and non-toxic. The plastic ring, plug and cap contain no polycarbonates and are food grade, FDA approved and recyclable. The sleeve provides a good gripping surface during feeding and also a great tactile experience for your baby. Features a traditional venting system. Takes a standard size (not wide neck) nipple.