FROSTLINE 5.0™ is insulated and waterproof, with excellent grip, made for all day comfort.  5MM INSU-FOAM ULTRA™ - gives all round foot comfort and insulation.   6mm NITROCELL™ footbed -  provides a soft cushioning for an athletic shoe feel. A million microscopic nitrogen bubbles that insulate the wearer from cold surfaces. UNDERFOOT CHASSIS™ - give a sure footed platform. HEXZORB™technology - absorbs heel strike shock for daylong comfort. SUPERDRI™ lining - is hard wearing, wicks moister away from the wearer’s foot to prevent a sweaty and uncomfortable feel. It is fungus and rot proof so will not smell like cotton-lined boots. TRAX™ outsole - superior grip on a variety of surfaces, the tread is designed to work with the action of the foot COMFORT RATING -  -20ºc to +20ºc.