The Vierzonord Plus boot features a thick 5mm neoprene lining and removable felt inner sole, backed with an aluminium film. This has been a firm favourite for thermal insulation for comfort in extreme cold weather conditions. The waterproof gusset and an adjustable tightening strap ensure a comfortable fit around the calf and leg. Shock absorbing dual-density grip outsole prevents fatigue, resists abrasion and is suitable for all terrains.