Neither rain nor wet roads will slow down your endorphin rush with the superior construction waterproof protection and responsiveness of the Mizuno Wave Rider 21 GTX running shoe! Predecessor: Wave Rider 20 GTX. Support Type: Neutral to underpronation (supination). Cushioning: Lightweight flexible response. Surface: Road. Differential: 12 mm. GORE-TEX upper technology delivers breathable waterproof protection from outside elements. Breathable mesh and synthetic upper materials. ' Triple Zone' engineered mesh boosts breathability movement and hold. DynaMotion Fit upper moves seamlessly with the foot. Lace-up closure. Lightly padded tongue and collar. Soft collar and interior lining helps reduce the likelihood of irritation. Removable foam insole. Top midsole layer features U4ic compound for 33% more response and greater durability. U4ic midsole works together with the Wave plate for a softer underfoot feel and smoother transitions. Cloudwave technology features an elastic thermal plastic wave running from the heel to the midfoot providing a ride that is soft smooth and responsive. Articulated U4icX heel wedge supplies greater cushioning for a softer feel. X10 carbon rubber offers long-lasting wear. Blown rubber located in the forefoot for improved cushioning and responsiveness. Flex Controllers located in high flex areas on the outsole act as miniature wave plates for increased flexibility and reduced weight. SmoothRide engineering promotes a great transition from heel-to-toe with each stride. Imported. Measurements: Weight: 10 oz Product measurements were taken using size 8.5 width B - Medium.Weight of footwear is based on a single item not a pair.