Pure Ceram coating on the inside and outside makes the cup resistant to acidic drinks and provides a neutral taste and preserves the natural smell of the drink, ceramic coating provides an optimal drinking sensation, Tritan lid, small lid opening for ar a safe and pleasant drinking experience, insulating effect, the outer wall of the cup will not fog up when used with cold drinks, when used with hot drinks the outer wall will not get hot, free of BPA, the perfect alternative to disposable cups, use and reuse for many years, recyclable 188 stainless steel, cups and lids are dishwasher safe