Double wall insulated to keep drinks cold for up to 8 hours and also keeps drinks hot for up to several hours 

Matching slider lid is provided for drinking on the go 

BPA free and California Prop 65/FDA tested • Base and walls of the tumblers are thicker than competing brands making them ~15% heavier and feel more like glass than plastic 

Insulate longer by approximately 5% due to thicker walls and base