Proven to reduce the force of typical head impacts during soccer such as head to soccer ball, head to head, head to ground, head to knee, and head to goal post by as much as 50%. Doesn't alter the way it feels to head the ball. Rebound speeds are the same as from an unprotected head. Impact absorbing ForceBloc Foam layer wraps around the head to protect the crucial forehead and temple areas. Ventilated, ultra lightweight 1.5 oz. design weighs less than a baseball cap. DuroStrength fastener, with overlapping side ribs comfortably conform to different cranial shapes. Outer 4 way stretch material simulates forehead texture and action, with uniform fit, and flexibility. Inner Tru Play SoftWeave whisks away sweat and maximizes comfort. Complies with FIFA law 4 and allowed by US Soccer.