Thermos 18-Ounce Stainless-Steel Hydration Bottle, Charcoal Thermos vacuum insulation technology for maximum temperature retention, keeps drinks refreshingly cold for up to 12 hours durable 18/8 stainless steel interior and exterior withstand the demands of everyday use A push-button sipper lid has a locking ring to prevent spills, so taking it on the go will be mess free Sweat proof design wont leave water rings Soft touch silicone grip is comfortable to hold