The GMC h2go Sync thermal bottle is made of double wall stainless steel. Vacuum insulation with a copper lining provided increased temperature retention. Dual wall construction helps keep drinks hot or cold for hours. Also designed to keep condensation from forming. Dual opening features a screw-on cap and a larger screw-on opening for adding ice. Tethered cap also doubles as a carrying loop. Stainless with a black matte powder coated finish on the bottom. Holds 17 ounces.