Crafted of durable food grade stainless steel, our 16oz vacuum insulated beer cup features a double wall design. The double walls acts as a barrier against outside temperatures, so your icy cold beverage will stay that way for hours on end. You won't leave water rings either as the disconnected interior does not build up condensation. You can also drink hot beverages without the heat seeping through. These mugs are BPA free, highly resistant to absorbing odors, bacteria, and tastes, meaning it will surely outlast your other cups in your cabinet.