ASICS Men's GEL-Cumulus 11 Running Shoe 100% 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 Twist GEL Cushioning System enhances shock attenuation and allows for improved toe-off position Twist Gel Cushioning System enhances shock attenuation and allows for improved toe-off position