Eight times stronger than steel by weight, Rhino Boot Laces are built for the toughest workers on the planet. Protected by a para-aramid fiber core covered with a blended sheathing, Rhino Laces maintain excellent dimensional stability--even in extreme hot or cold environments. Available in Foliage Green, Coyote Tan, and Coyote Brown, Rhino Laces come with a lifetime guarantee from breaking while on your boots. You've found the strongest, most durable bootlaces available.