New - Martial Arts (Century) Size (Large) Black Mat Socks - Keep your feet covered without sacrificing foot-grip during training. Mat socks are made from a comfortable nylon blend with textured neoprene grips to give you traction on the mat. They're great for all martial arts training (especially if you're trying to avoid mat-burned toes)! Size Large, Black. Normally sells for $17 + shipping. New, still in the packaging. Selling for $10.