Our warmest waterproof winter boots in a classic pac style for the coldest environments. Injection-molded waterproof TPR shell; leather upper with waterproof/breathable membrane. Exclusive insulation protects from severe cold. California residents, read the Proposition 65 WARNING California Proposition 65 WARNING WARNING: This product can expose you to chemicals including chromium (hexavalent compounds), which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov