10 Best Heated Long Johns 2025 in the United States

This men's heated thermal underwear set features 16 carbon fiber heating zones covering key areas such as the shoulders, back, waist, and knees, providing comprehensive warmth for both the lower and upper body. It is ideal for outdoor winter activities or staying cozy indoors. Users can adjust the temperature across three settings—110°F, 120°F, and 135°F—with an automatic shutoff when the highest temperature is reached, ensuring safety during use.

The set includes two rechargeable 10,000mAh lithium polymer batteries that connect via USB, offering up to 8 hours of heating on a full charge, making it suitable for extended use without interruption. The fabric is a soft cotton blend designed for comfort and is machine washable with care to preserve the heating elements. Available in sizes from S to 2XL and tailored to standard American body shapes, the underwear fits snugly while allowing sufficient stretch for movement. Reinforced cuffs and fast-drying material enhance durability and comfort.

While the heating coverage is excellent, carrying the power banks might feel somewhat bulky depending on the activity. Selecting the appropriate size is important as a tight fit improves heating efficiency; sizing up may be preferable for those who want a looser fit. This heated underwear is well-suited for outdoor enthusiasts like hikers and skiers or individuals with circulation issues, thanks to its long battery life, multiple heat settings, and comfortable material that supports daily wear.

The Gerbing Heated Pant Liner is designed mainly for motorcycle riders or outdoor enthusiasts who need reliable warmth in cold conditions. It uses a durable Ripstop nylon shell with a soft taffeta lining, making it windproof and comfortable as a mid-layer under your outerwear. The heated elements rely on patented Microwire technology, which provides even heat across four zones on the legs and hips, helping to keep you warm without hot spots.

Instead of a built-in battery, it connects to your vehicle's 12V power system, so battery life depends on your ride, not on a separate pack. This means it's great for long rides but less convenient if you want to wear it off-vehicle. Heat settings and controllers are sold separately, so you’ll need to invest in those to easily adjust your warmth. The fit is snug, designed to layer smoothly under other clothing, but be sure to check sizing since it’s a liner, not a standalone pant.

Controls link seamlessly with other Gerbing heated gear via the advanced interconnect system, which is handy if you want a full heated outfit. Washability requires hand washing only, so extra care is needed to maintain the garment. For those seeking heated long johns that hook up to a motorcycle or similar vehicle and offer targeted heating zones, this pant liner represents a solid choice. However, casual users wanting battery-powered, fully wireless heated pants might find it less practical.

The YZHFFHLF Heated Thermals Underwear set is designed to keep you warm with its impressive 42 carbon fiber heating zones spread across key areas like shoulders, back, waist, and legs, providing balanced heat distribution. It uses a USB/DC dual-interface, so you can power it with a variety of 5V to 7V power banks. With a suggested 20,000 mAh power bank, it can provide warmth for up to 10 hours, which is great for long outdoor activities in cold weather. The set features three heat settings that let you adjust the temperature easily via buttons on each piece, allowing separate control for the top and bottom. This makes it convenient to tailor the warmth to your needs.

The material is a soft blend of cotton, polyester, and spandex, offering comfort, breathability, and flexibility for daily wear. The fit is close but you can size up if you prefer a looser feel. Controls are simple, with one-button operation and clear indicator lights for temperature levels. The thermal underwear is washable after removing the power source, which is a practical plus for maintenance.

The product does not include a power bank, so you need to buy one separately. Also, while the heating system is extensive, the actual temperature achieved can vary depending on the power bank used. This set is a solid choice for anyone needing reliable warmth during winter activities like skiing, camping, or outdoor sports, especially if you want good heat coverage and long battery life. It is important to consider the need for an external power source and the fitted style when selecting your size.