Technora Toughlaces are the strongest boot and shoe laces ever created. They are 8 times stronger than steel, fire resistant up to 932 degree F, highly abrasion resistant, and hard as hell to cut. The Toughlaces are made from Technora fiber which is a high tech aramid like Kevlar, but better as it excels in flex fatigue which means it is commonly used in fire rescue ropes to save lives, body armor to stop bullets, and high performance sails to win world cup races. To make sure these laces are the toughest ones on the planet they are braided to be as dense and tight as possible. The ends are fitted with a crimped on metal tip; no plastic to split and fall off. The results are boot laces that will outlast your boots. These are designed, tested, made and finished in house by hand, right here in the USA. They are sold as a pair. To confirm sizing it is best to take the old laces out of your shoes or boots and measure them with stretch, as these laces do not stretch.