The F90 Select is Full90's first fully adjustable model. Constructed with ForceBloc Foam and outer 4-way stretch material, the F90 Club simulates forehead texture and action with a uniform fit and flexibility. The Inner Tru-Play SoftWeave whisks away sweat and maximizes comfort while the DuroStrength fastener, with overlapping side ribs, comfortably conforms to the head. With this advanced Tru Play Design¿, the forces of a typical soccer impact are reduced by 50% while the rebound speeds of the ball are not altered. CAP SIZE SMALL= 6 1/8 - 6 7/8, MEDIUM= 6 7/8 - 7 5/8, LARGE= 7 1/2 - 8 1/8