* Insulating and water-resistant materials. The ActionHeat Heated Base Layer Pants are made of ultra-light yet insulating polyester. The polyester fibers are interwoven with a bit of spandex that gives the pants their elasticity. The pants feature a slim fit, and comes with an elasticized waistband, so you can easily slip them on.  

*  Far-Infrared carbon fiber heating elements. This pair of pants is equipped with Far-Infrared carbon fiber heating elements that produce a warmth you can rely on even when you're skiing or hunting in sub-zero temperatures. The heating elements are positioned over the left and right knees/thighs, plus another at the backside. ActionHeat calls this the Tri-Zone heating system, and it efficiently and effectively provides warmth and comfort in areas where you need them most.

* With 3 heat levels. The warmth produced by heating elements can be adjusted using the built-in touch control button positioned at the waist. Simply press the button to power it on or adjust the temperature from low to medium to high. Each change in temperature is indicated by a change in the button's colors.

* With 5v ActionHeat 6000 mAh lithium-polymer power bank. This pair of pants comes with its own 5v 6000 mAh power bank that is connected to the heating elements via a USB cable. This battery is stored inside the pants' right pocket. With a wall adapter and multiple USB ports.

The ActionHeat Heated Base Layer Pants work well even when worn underneath jeans, motorcycle chaps, or any other loose fitting pants. But the battery life and the heating elements need to be improved.

* Protective design and insulating materials. The outer layer of the Mobile Warming Dual Power Heated Pants is made of Wind-Shark®, a 4-way stretch softshell fabric which offers ample protection from the onslaught wind and water. The pants are lined with Rainguard®, a fleece lining that reinforces the pants' water-resistant properties. Designed to resemble cargo pants, these pants have a relaxed fit and multiple pockets, making them perfect for work or for play.

* Multi-zone Far-Infrared heat elements and 4 heat settings. These pants have 3 heating elements positioned on the right and left knees, waist, and seat. With 4 heat settings so you can adjust the temperature according to the weather condition. Simply press the integrated touch control button to power it on or adjust the temperature of your pants.

* With dual power options. These pants come with a 12v 5.2mAh lithium-ion battery that you can use when you’re away from your vehicle. But if you want a more dependable power source, then use the 12v power lead adapter which allows you to connect it to your bike, snowmobile, or ATV's power source. These pants allow you to maximize the warmth with the help of the Dual Power technology. This allows you to connect the pants with a Mobile Warming heated jacket or vest using a separate Y-harness (sold separately).  

* Lasts up to 11 hours between charges. Its powerful lithium-ion battery can last up to 11 hours, so you can ride your motorcycle, ski, hunt, fish, or work longer.

The multi-zone heat panels, premium materials, and dual power options all make the Mobile Warming Dual Power Heated Pants one of the best -- and most expensive -- heated pants in this review.

You can wear them underneath a pair of loose fit jeans, motorcycle chaps, or any loose fit pants to keep your legs protected from the cold while you ride or work.

* Insulating materials fused with a lightweight design. The Venture Heat Heated Pants have a nylon-spandex blend outer shell. This blend of materials ensures that the pants are not only soft and elastic but also insulating and protects your legs from wind, rain, and melted snow. The lining is a made of luxurious brushed fleece which serves as an additional insulating layer and barrier between your skin and the heating elements. These pants are lightweight and feature a regular fit, making them perfect with jeans, snow pants, or any other loose fitting pants.  

* Xtreme Comfort Technology (XCT) heating system. The pants are equipped with Xtreme Comfort Technology (XCT) heating system which uses micro-alloy fiber heating elements. The heating elements are so fine and light you'll barely feel that the wires are there while wearing the pants. The temperature can be adjusted by pressing the button located at the waistband. Like other pants in this review, the button changes colors whenever you adjust the temperature.

* With multi Tri-Zone Heating Area. The heating elements are positioned where you need them most: the right and left knees, plus another panel on the rear hips. This positioning makes these pants ideal not just for athletes, but also for those who are recovering from knee and hip injuries and other health conditions.

* Includes a high-capacity and long-lasting lithium-ion battery. These heated pants are powered by a high-capacity 7v lithium-ion battery that is stored inside a secure pocket.

The Venture Heat Heated Base Layer Pants are the most inexpensive and highly rated heated bottoms in this list, making them a great investment for athletes and even those who have knee, hip, and leg issues. The quality of the battery and its run-time, however, should be improved.

​* Insulating and elastic fabric. The Mobile Warming Primer Heated Base Layer Pants are the ideal base layer for skiing, hiking, hunting, and other winter activities. These pants are made of a polyester-spandex blend, and this fusion of fibers ensure that the pants are elastic, insulating, and lightweight. They have anti-bacterial and anti-static properties, plus flat-lock seams to prevent chafing.  

* Stretch and insulating pant liners. Protect your hips and legs from the cold with the Firstgear 12v Heated Pant Liners. These liners are made from stretchy spandex so riding and maneuvering your bike on the road is easier. The fabric is treated with anti-bacterial and Moisture Management so it remains dry and odor-free even when you sweat.

* 3 heat zones. The heating elements of the Firstgear 12v Heated Pant Liners are located on the thighs and knees -- parts of a rider's legs that are most vulnerable to the cold. But these heat panels can be inadequate, especially if your lower legs and lower back are also prone to being cold.

* Uses a DC power source. This unique pant liner uses your motorcycle's battery to power up the heating elements. This eliminates the need for a battery that might not be as long-lasting, and is great especially for hours-long rides on the open road.

Overall, the Firstgear 12v Heated Pant Liners are a great product for motorcycle riders with their lightweight yet insulating materials and adequate heating elements.

But the heating elements can sometimes get very hot and come with a high price tag. Note that this uses a DC power source, and a battery and wall charger are not included in the package