Manufacturer: Kenby Sports Socks Laboratory Size: 25.0 - 27.0 cm Sock Length: Approximately 38.0 cm above the heel (stretches when worn) Color: Black My son used to get holes in his big toes very quickly, so we were constantly buying new socks. We tried various brands, but we finally settled on these socks. Since switching to these socks, he hasn't had a single hole in his big toes. He didn't get any holes even during his high school club activities. (This is just based on my son's experience.) If sold individually, one sock is available for 700 yen.