Viking Footwear Bushwacker Caulk Waterproof Steel Toe Boot 100% Nitrile Rubber NBR caulked, spiked sole having limited chemical resistance. Abrasion-, chemical-, and oil-resistant. Ultra flexible: Exceeds 305,000 Flex Rating. Snug Fit design and ergonomic insole. Air-cushioned heel with achilles tendon, ankle and metatarsal protection. SBR blended NR upper with cotton canvas lining. Highly chemical resistant rubber upper and nylon cuff to seal out debris and dust Ideal for Clearing Saw Operators, Brush Cutters, Scarifier Operators, Forestry Crew Persons, Forestry Conservation Workers