These insulated bottles are made from premium 304 grade stainless steel. Double wall vacuum insulation means they will keep your drinks cold for up to 24 hours. The silicone sleeve creates a non-slip base to stop the bottle sliding and creates a really nice hand feel. Perfect for little and big hands alike. - Leak Proof - Double walled vacuum insulated steel construction - BPA free lid, straw and silicone sleeve - 22cm tall - 7cm diameter - 500ml capacity All bottles come with an extra straw and straw cleaning brush free of charge. NOT SUITABLE FOR CHILDREN UNDER 3 YEARS