This is a 20 oz (591 ml) double wall 18/8 stainless steel bottle with threaded lid and clip-on nylon strap. The threaded lip, narrow opening, vacuum insulated body and copper plated inner wall help retain the internal temperature longer.
The copper plated inner wall can make a difference of 41° F/5° C over 24 hours and prevents heat from entering or exiting the bottle by thermal radiation.
HOT 8 hours. COLD 16 hours.
Hand wash recommended.