ColorsSilverBlackRed Weightapprox. 12.8 oz. UpperLightweight breathable mesh. HRC Strobel Board to increase cushioning and step in comfort. Hydrator collar lining. MidsoleHeel ProGrid to absorb impact and dissipate shock. Dual Density Impulse EVA for greater durability and responsiveness. SRC Impact Zone that provides shock attenuation and sets the foot up for a smooth transition. SRC XTRA forefoot cushioning provides a smooth toe off. OutsoleXT900 Blown rubber outsole.A light stability, everday training shoe with a dual density midsole that helps to slow down mild overpronation. The Guide 4 provides superb cushioning and flexibility. Supportive smooth ride. Memory foam padded heel counter for a fit that conforms to the runner's foot. Carbon outsole material offers exceptional traction properties without sacrificing durability.