THERMOS Vacuum Insulated Stainless Steel Sport Bottle with Covered Straw, 18-Ounce, Teal THERMOS vacuum insulation technology keeps contents cold for up to 16 hours Snap closure on lid protects the silicone spout, keeping it protected Large diameter silicone straw is removable and easy to clean; ideal for shakes and smoothies Durable stainless steel interior and exterior; Sweat-proof design wont leave water rings 18-ounce capacity