1、Food Grade Material: The inner wall of the water bottles insulated is made of 304 grade food grade stainless steel, and the outer shell is made of 201 stainless steel 2、Safe and Healthy: The water bottles insulated are not easy to slip and spill, which is not easy for leakage and safe to use on the go 3、Easy to Clean: The water bottles insulated have a simple structure and a large diameter of the cup, which is easy to clean. The mouth of the cup is glossy and won't cut the lips 4、Removable Filter: The water bottles have a removable filter to filter debris such as tea leaves. 500ml capacity fits most cup holders and fits easily in a travel bag 5、Scope of Application: Ideal for hiking, biking, shopping or at the office, your cold drinks will stay refrigerated for up to 24 hours, or your hot drinks will stay hot for up to 12 hours 1 x Water Bottles Insulated Item Type: Water Bottles InsulatedMaterial: Inside 304, Outside 201Capacity: 500mlInsulation Performance:Above 70℃: 6 HoursAbove 60℃: 12 Hours