Boot Guard KG Extreme Adults Boot Laces Black 108-in 108-in BLACK These 100% and heavy duty nylon laces are braided together wax coated and then flame resistant fiber tipped to form the toughest lace around! You wont have to be afraid to get these laces dirty. They are chemical resistance fire resistant and virtually unbreakable. These tough boot laces make the perfect gift for any welder machinist firefighter construction worker or anyone else in your life that wants laces as tough as the boots they trust each day! Most 6-inch work boots use 54 in54 in. 54 inch laces and most 8-inch work boots use the 72 inch laces.