DESIGN: Custom-Moldable Shell conforms to your shin for a perfect fit SLEEVE: Dual-Pocketed Sleeve with NikeFIT DRY Technology provides a secure fit for protection on the front, back and side of the leg PROTECTION: Low-Profile Memory Foam Ankle/Achilles Shield protects the vulnerable area between the guard and the boot PROTECTION: Removable, Ventilated Calf Pad Insert provides extra coverage when you need it SP0197