i purchased these laces specifically because of the Kevlar reinforcement. I got just short of a year out of the original ones that came with my boots. Since I rotate my boots every day, that actually translates into only about 6 months of use.<br /><br />I've had these laces on the boots for 4 months, and they are already showing signs of wearing out.<br /><br />I would have expected more out of them, given the Kevlar.