These kevlar boot laces made by Schmidt's Boots are engineered for demanding professions like welding, concrete cutting, wildland firefighting, construction, etc., offering unparalleled performance through their remarkable properties: they boast high tensile strength (8 times stronger than steel and 3 times stronger than fiberglass, polyester, and nylon yarns), exceptional fatigue resistance against repeated abrasion and flexing, superior dimensional stability due to their stiff molecular structure, impressive heat resistance (maintaining integrity up to 930ºF and retaining over 50% strength at 480ºF), and outstanding chemical resistance against acids, alkalis, organic solvents, steam, and seawater. Made in America using 100% Kevlar and features stainless steel tips.