40 oz steel zero degree bottle keeps beverages hotter or colder longer.
Rubber ring keeps screw-on lid attached to the bottle.
BPA free.
NOTE: Product comes with Prop 65 warning label. Label reads: "WARNING: This product may contain carcinogen, which is known to the State of California to cause Cancer and Reproductive Harm. For more information, go to www.P65Warnings.ca.gov.