After a hard day bulldogging the sled, slide into the 509 Ignite Slipper Boots and enjoy warmth and comfort while your feet thaw out. With a high-traction lug sole, 200 grams of insulation with a micro fleece liner, and easy on-off opening, the biggest feature of these boots is the toasty power of Ignite technology. Low, medium, and high settings heat up quickly and stay warm thanks to built-in 2000 mAH li-ion batteries. Features: Ignite heating elements with controller for high, med, low setting 2000 mAH li-ion battery in each boot, secured into battery pocket Easy on and off for the parking lot, snowmobile boot off, slipper on 200 gram Thinsulate insulation Thermal micro fleece liner Lug sole for traction 509 Ignite Slipper Boots