Royal Racing Merino Short Socks 35% Merino Wool, 35% Acrylic, 4% Polyester, 24% Nylon, 2% Lycra Imported Premium merino wool - natures finest 30mm rise to encompass ankle and lower calf Flat stitched seamless toe Re-enforced heel for durability Asymmetrical left foot/right foot padding Premium merino wool - natures finest with a 30 mm rise to encompass the ankle Re-enforced heel for durability and incorporated arch stabilizer Contoured 'y' heel for increased comfort Flat stitched seamless toe Cool mesh zone