Wigwam Catalyst Running Socks - An Ultra-lightweight running sock that fits like nothing else out there. SynchroKnit construction drops stitches out of the knitting process to create a sock that is shaped like a foot and not a tube, allowing for proper support and contoured fit. Synchroknit patented contour knit Double 'Y' heel gore provides the most precise heel fit 'Y' gore toe box gives room for natural expansion Seamless internal toe seam Size knit into cuff 49% polyester, 38% stretch nylon, 7% tencel, 6% spandex Style: F1292