This 16-ounce silicone glass is more than a rugged alternative to the beer glass. From the patio to the campground, beach vacation or daily commute, these colorful, versatile drinking glasses are as flexible in shape as they are in utility. Ding Drx Surf Shop silicone cups have thick and sturdy, yet squeezable walls that are not too squishy, and a grippy outer surface for extra safety. Dishwasher and microwave safe.