Safe MaterialDouble wall vacuum insulation coffee mugHigh-quality BPA-free Lid,304 stainless steel material interior and adopt one-piece molding technology, not easy side leakage and damage.keeps drinks odor free. Screw-On Leakproof Lid and Non-slip Rubber CushionSpill proof travel coffee mug With screw-in threaded cup lid is equipped with a sealing ring, which provides a good leak-proof effect.Anti-fingerprint matte surface, comfortable to touch.Air vent on the mouth piece ,allows beverages to flow out smoothly, without gushing or overflowing.There is a rubber cushion on the bottom of this coffee cups that helps stop it from sliding about and protect furniture from scratches and chips. Keep Your Coffee Hot and Cold for HoursThis Coffee thermos for maximum temperature tetention, hot drinks keep warm for up tohours and cold drinks stay cold for up to hours,and feel energized for the day. Wide ApplicationThis coffee mugs great for daily life and outdoor adventures and fit most of vehicle cup holders, home, office, parties road trips, camping , traveling, in the car,at the beach, hiking, sporting active, picnics, just about any other activity you can dream up. This sturdy and durable quality, carefully designed, durable, fall-proof, rust-proof, Better than using plastic or glass bottles.This coffee mug thermos is also a good Ideal for business gifts and family gift