PAF System
PAF is an innovative heel system that helps both spread the force of the heel tension, which also helps with over-compression of the toe box, and increase the fit of the heel. The aggressive tension-rubber is interrupted behind the heel to reduce pressure on the Achilles tendon and connected with softer rubber, that works like a bridge and allows full adaption to the shape of the heel. The holes on the side of the heel indicate the tension applied, which varies between 1 hole for light tension, 2 holes for mid tension and 3 holes for strong tension.