Built for the toughest jobs and harshest environments, Ironlace™ Unbreakable Boot Laces are engineered to deliver unmatched durability and performance. Made from advanced para-aramid fibres that are stronger than steel, these premium boot laces offer an incredible 1,500 lb breaking strength per pair while remaining stretch-free and non-slip for a secure fit that stays tied all day. Resistant to abrasion, chemicals, UV exposure, water, and corrosion, they are also heat and fire resistant up to 630°F (332°C), making them ideal for tradespeople, firefighters, welders, hikers, and outdoor professionals. Designed to outlast ordinary laces and backed by a lifetime guarantee, Ironlace™ laces provide reliable, long-lasting performance when failure is not an option. Product Details STYLE: L30003/L30005/L30007/L30009/L30013 Material: 100% Advanced Para-Aramid Fibres that are 20 Times more durable than Kevlar bootlaces. Features: World's longest-lasting laces Abrasion, Chemical, UV, and Corrosion-Resistant Fire-resistant to 630F (32C) Waterproof Cut-resistant and fatigue-resistant Colour: Black Size: 45-96" Applications for Use: All work boots and safety shoes