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Thermals FAQs

What’s the difference between a base layer and thermals?

Though the terms are often used interchangeably, thermals are a special type of base layer designed to insulate and lock in heat. While both are worn under outer clothing layers and help regulate body temperature, base layers also manage moisture, wicking sweat away from your skin. Thermal pieces meanwhile are often crafted with wool or fleece-lined to keep you warm. Explore our online selection of thermals with Heatgen™ technology, which traps heat without adding bulk.

What should you look for in thermal underwear?

When shopping for thermal underwear, look for our Heatgen™ stretch fabric featuring insulating properties that ensure warmth and comfort in cold weather. Choose a long-sleeved roll-neck top and full-length leggings for complete coverage in the winter. On frosty mornings, layer up with a pointelle T-shirt or vest and opaque fleece tights for extra cosiness. Our collection of thermals includes fitted bodies to eliminate chilly gaps between your clothes, and snuggly Sumptuously Soft™ socks.