Grubs Womens Frostline 5.0 Boots Tawny Red.The Grubs Womens Frostline 5.0 Boots are ideal waterproof. insulated boots for most work or leisure activities. The Frostline 5.0 offers Grubs unique 5mm Insu-foam ultra technology with advanced 5.0 thermal engineering providing a comfort rating between -20ºc to 20ºc. The boots offer under foot chassis and Nitrocell insulating and cushioning foot bed for support and comfort. The Frostline 5.0 Boots feature a Trax sole pattern which offers superior grip on a variety of surfaces, the tread is designed to work with the action of the foot ensuring your feet are always comfortable.They also feature a 2mm thick layer of tough rubber on the lower calf area for protection against damage against brambles and other potential damaging factors, HEXZORB technology which absorbs heel strike shock for daylong comfort and they are finished with SUPERDRI lining which is hard wearing and wicks moister away from your foot to prevent a sweaty and uncomfortable feel. It is also fungus and rot proof so will not smell like cotton-lined boots.