The bottle made of 18/8 food grade stainless steel, insulated tumblers adopt double walled vacuum insulation that can keep your beverage hot or cold for hours.The insulated tumbler cup come with 2 BPA free lids. The sip design lid allow you to sip,drink or gulp, choose your own way for drinking.This mug has a narrow bottom design which make it fits most cup holder in car. Designed with non-sweat design, the outer layer is coated with powder which can keep your tumbler dry and neat when holding.