ASICS Men's GEL-Resolution 2 Tennis Shoe Synthetic and mesh Rubber sole Impact Guidance System (I.G.S.) enhances the foot's natural gait from heel strike to toe-off Solyte midsole material is lighter than ASICS' standard EVA and SpEVA, combined with improved cushioning and durability GEL Cushioning System attenuates shock during impact phase Biomorphic fit upper provides a superior fit and function, ComforDry sockliner provides optimal cushioning performance in a cooler, drier, healthier environment PHF (Personal Heel Fit) features a Memory foam lined heel collar that molds to the athlete's heel, creating a personalized fit, PGuard toe protector enhances toe durability