adidas Performance Pro Youth Shin Guard Special youth sizing with a smaller shield and lower profile makes this a perfect guard for young players Flexible, light shield offers an ideal fit and quality protection Single strap closure for customization, with ankle sock and adjustable guard width This guard has special youth sizing, so it will fit smaller than an adult shin guard in the same size. Youth Guard sizing: Small guard shield is 5" long, Medium guard shield is 5.5" long Youth Guard sizing: Large guard shield is 6" long, X-Large guard shield is 6.5" long.