Heated Long Underwear

ActionHeat heated long underwear pairs a heated base layer shirt with matching heated base layer pants which runs on the same 5V battery. Wear the heated long johns under anything or layer just the piece you need.

Battery Powered Thermal Long Underwear

The shirt and pants use the same Tri-Zone heating system and 5V battery. Wear them together beneath a shell in colder conditions, or wear the shirt alone when less warmth is needed. Both fit comfortably under regular clothing without adding noticeable bulk. 

Shop Similar: Heated Base Layer Shirts | Heated Base Layer Pants | Heated Vests | Heated Coats and Jackets

Choose Your Comfort Level

High runs 130°F for 2+ hours, medium settles at 110°F for 3+ hours, and low stretches to 90°F for 4.5+ hours. Every battery passes UL certification and third-party testing before it ships.

2+ Million Units of Heated Clothing Sold

We’ve sold 2 million units of warming apparel both online at Bass Pro Shops, Cabela's, DICK'S Sporting Goods, and Academy Sports. Every pair ships with a 1-year warranty on electrical components and garment materials/construction, plus 90 days on batteries and chargers, free shipping over $50, and 30-day returns.

FAQs

Yes, heated underwear is a thing and uses rechargeable heating elements to provide targeted warmth under your outer layers. ActionHeat heated base layers help keep your core and lower body warm in cold conditions.
Heated long johns can provide several hours of warmth per charge, depending on the battery and heat setting. ActionHeat heated base layers offer adjustable heat so you can balance warmth and battery life.
Yes, traditional long underwear is generally warmer than lightweight leggings because it is designed specifically to provide insulation and moisture management. Heated long underwear adds active warmth for even greater cold-weather comfort.
Thermals work best when they fit snugly against your skin without restricting movement or circulation. A close fit helps trap body heat and allows moisture to move away from your skin.