Cierre 3 16 mug is made of ceramic or stainless steel, and the vacuum layer can hold water. The top is covered and sealed tightly. Vacuum insulation layer can delay the heat dissipation of water and other liquids in it, thus achieving the purpose of insulation.
Cierre sports cup is made of high quality PC plastic. PC, also known as polycarbonate, is an engineering plastic with good physical properties and heat resistance. It is generally believed that PC is safe for daily use at room temperature and has little impact on human body.
To sum up, cierre 3 16 thermos cup is a cost-effective product worth starting with.