The Men's Gel Kayano 21 Running Shoe represents all of Asics' most comfortable features for a fully cushioned ride. Its FluidFit upper mixes multi directional stretch mesh with stretchy reinforcements to completely conform to your foot, provide breathability, and ensure mobility. Asics added a ComforDry X 40 Sockliner to manage moisture, increase breathability, and resist odor. Going beyond comfort, the Gel Kayano features multiple technologies to give you a solid stride, whether you're an overpronator or not. FluidRide technology brings the bounce back and cushioning without a ton of weight, and the Gel Cushioning Systems cover the rearfoot and forefoot to attenuate shock. The Impact Guidance System uses a Guidance line and the Guidance Trusstic System to enhance your foot's natural gait from heel to toe off. Asics' Dynamic Duomax Support System improves stability and support, and the Heel Clutching system secures your heel for a precise fit. The Gel Kayano also features Asics' High Abrasion Rubber for long lasting durability.