HIGH QUALITY & VACUUM INSULATED : Food grade 304 stainless steel on both inside and outside walls. Free of BPA materials, chemical toxins or metallic aftertaste transfer. LONG HEAT RESERVATION : Double-walled vacuum insulated stainless steel container insulates heat for up to 12 hours and isolates cold for about 12 hours. ONE-HAND OPERATION : With an innovative closure, this isolation cup allows one-handed operation by briefly releasing and pressing the side button. It is ideal for outings and office work. ENDLESS POSSIBILITIES : The stainless steel bottle is ideal for use at home, at work, at sports, in the car, on the beach and even during camping or hiking. Ideal for water, tea, coffee, carbonated drinks, wine and beer. EXCELLENT DESIGN: The leak-proof lock design is used to firmly lock the lid to avoid water leakage. Elegant curved cup design with ergonomic design. It is very easy to disassemble and clean.