Dunlops Acifort provides extra chemical protection from fuel and acids. Specially formulated Acifort outlasts the competition, offering heavy-duty protection. Acifort is Dunlop's unique invention of PVC, nitrile rubber, and polymers. Acifort improves durability and flexibility, improving comfort and lifetime of the boot. Features a steel toe cap and steel mid-sole. Fit perfected with Dunlop's innovative Snug-fit that eliminates heel slippage and reduces foot fatigue. SRC-rated outsole designed for maximum grip on the toughest terrains with a tread wear indicator to monitor outsole performance. SRC outsole designed for stability indoor and outdoor. 100% Waterproof. EN ISO 20345:2011 ankle protection. EN ISO 20345:2011 S5 SRC AN. Replaces A4422B1. Acifort heavy-duty yellow.