Product Description: High quality double layer stainless steel inner liner vacuum design insulation effect: Above 50 ℃ for 6 hours, above 40 ℃ for 12 hours. The inner liner surface adopts electrolytic grinding technology to prevent dirt from forming sealing rings, and food grade PP grade materials are used along the mouth. The health and worry free cup cover and stopper have good sealing performance without dripping. Product Description: High quality double layer stainless steel inner liner vacuum design insulation effect: Above 50 ℃ for 6 hours, The surface of the inner liner above 40 ℃ for 12 hours adopts electrolytic grinding technology to prevent dirt from forming sealing rings. The unique button type cup cover switch along the mouth is easy to press and immediately pop open, making it easy to drink freely