The basics Shibue Silicone Nipple Cover Ups The benefits They are washable and reusable and come with a storage liner. One size fits all.  The uses They adhere to the body with a silicone adhesive and have a soft fabric center to protect the nipples. The bottom line Shibue Silicone Cover Ups naturally blend to all skin types to give a smooth appearance and conceal the nipples. 100% Silicone.