Simply screw up the mouthpiece to open the seal on the bottle and enjoy little sips or longer chugs of your favorite drink. When closed its an airtight and leak proof metal water bottle with no drops of condensation. Our bottles are BPA free and non-toxic so totally safe for you and your kids to enjoy. The non-slip silicone sleeve protects both the base of the metal thermos flask from scratches and dents as well as protecting your furniture from scratches. The base attaches easily and can be removed for cleaning as can the lid. All lids and silicone bases are dishwasher safe.