RedbacK Great Barrier Work Boots Nevada Puma Water Resistant UNPU Leather Slip Resistant - MARK II Machine tested slip resistant on oil, acid & water. Anatomic Support System - Redback's unique Anatomic Sole cradles the foot to reduce arch sagging and prevents foot strain, fatigue and related leg and back pain. Electrical Hazard Safe - Our boot meets and exceeds ASTM F2413-11 standards for Electrical Hazards. Commonly used by: Farmers, Winery workers, Brewers, Fisherman and anyone else that comes in contact with water.