Size/Fit Summary: True to size, Regular fit. If you are in-between sizes, have a wider calf or want to wear a thick sock, it is recommended to size up. Designed with colder climates in mind, the Original Tall Rain Boot is updated with an insulated Sherpa fleece lining to further protect against winter chills. Able to be worn in temperatures as low as 23°F (-5°C), your legs and feet will be feeling snug. First introduced in 1956, the Original Tall Boot is a globally recognised icon. Handcrafted from 28 parts, each boot is constructed from natural rubber, which has been vulcanized for a fully wateproof and durable finsh. In a grey matte with vibrant red accents, venture out with the confidence that you will be completely protected.