ASICS Men's Gel Hockey Pro Field Shoe 8.5 D [Apparel] Impact Guidance System (I.G.S.) enhances the foot's natural gait from heel strike to toe-off Raised-gradient heel places the foot in a more natural position to the ground and helps to reduce strain on the structures of the leg. GEL Cushioning System attenuates shock during impact phase Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability