FXR�s Warmest Boot, Extremely comfortable for endless miles of trail riding Rated to -75degree C with 1200g insulation Molded inner heel flex insert for backward flex control and impact support Slip-on removable liner with micro fur lining Minimal seams in sled-contact areas Heavy duty 2mm genuine rubber reinforcements Front & rear pant cuff attachment system Molded ultra low profile toe box 20mm thick EVA midsole for maximum impact absorption FXR high traction outsole with toe and heel kick Achilles and calf cushion support LACE SYSTEM BOA BOA single H3 Coiler reel