The Skate Fender Compact Pro is molded in the same high grade polycarbonate as the Full Pro model. Skate Fenders Compact Pros are currently available in two adult sizes: SMALL-MEDIUM, which fit most skate boots from size 8 down to 5 (or even smaller depending on boot width and style) and LARGE, which fit most boots from size 8 and larger. Boot style and width are factors that may affect fit. If you have any questions about fit please contact us. Both sizes are adequate shields for your feet against high-velocity hockey pucks.