TherMax® double wall vacuum insulation locks in temperature to preserve flavor and freshness. Unbreakable 18/8 stainless steel interior and exterior withstand the demands of everyday use. Separate infuser and drink lids let you brew and enjoy, all in one container: Infuser lid lets you brew tea right in the tumbler. Splash resistant drink lid lets you enjoy any beverage on-the-go. Volume: 12 oz.