You want to hit those snowmobile trails and not even think about having cold feet. Than look no further, this is the Pac boot you are looking for. Insulated with a 13mm felt material consisting of wool, polypropylene and a Radantex® foil these boots will keep you warm and dry the whole day. Features: INSULATION: *See Sorel® ThermoPlus™ Innerboot spec (13mm) on bottom of page. SHELL: durable and water resistant polyurethane backed, 1000 denier Cordura nylon with draw string closure. OUTSOLE: made of natural rubber to retain natural flexibility under a wider range of temperatures. SOLE: Air Bob design for a grab and release traction, creating full force traction every step you take. Rated to -100ºF (depending on activity level) Men Imported.