Muay Thai knee strikes are one of the most powerful strikes in any martial art. It delivers - flying knee strike especially - an explosive knockout power to your opponent's body. Digitally Printed on soft superior 100% Cotton, Triblend, 50/50 premium Soft Style Quality T-shirts. Not Slim Fit Size XXL is Heavy Cotton. The Design Is Blended into the fabric of the shirt, No Peeling or Cracking High Quality Print. Quick Shipping By USPS First Class mail.