The Nike Protegga Shin Guards features a shape designed to mimic the leg to help provide a natural fit.
Material: 52% K Resin, 35% EVA, 8% Polyester, 5% Nylon
Nike Adult Shin Guards & Knee Pads Sizing Guide
The size of shin guards required is calculated based on a persons height with measurement of height taken without shoes on and feet slightly apart.
Guard size can vary slightly been brand and style however these sizes are a good guideline.