Gear Review: Thinsulate Thermal Insoles

Boost your boots' warmth with these insoles.

Swap out your skimpy footbeds for Thinsulate Thermal Insoles, which kept testers’ feet warmer when they were hiking or standing on snow. The insoles have four layers of supportive foam, insulation, and antimicrobial fabric (to prevent stink), making them relatively thick; they fit best in high-volume boots. $20; 4 oz.;