X502 Series-Shoe laces for athletes in harsh environments such as mountaineers and winter athletes
 
 The X502 series has the strongest tension in the history of XTENEX, and the thick and firm shoelaces make it ideal for use in harsh environments in addition to the load during exercise.
 
 The installation method of the XTENEX series is as follows.
 Stretch the laces through the shoe holes (which reduces the size of the knots), select the desired number of knots between the shoe holes, and set them apart. Repeat this process between each shoe hole to fit.