When Designing The New Gel-Nimbus® 17, Asics Opted For A Little More Revolution Than Evolution. Serious Weight Reduction Takes Center Stage, With A Nearly Seamless Fluidfit® Upper That Fits And Feels Like A Runner’S Dream. The New Fluidride® Midsole And Extended Rearfoot And Forefoot Gel® Cushioning Systems Improve Upon The Already Famously Plush And Luxurious Ride. Nothing But The Best Would Do Underfoot, Thus A New Top-Of-The-Line Comfordry™ X-40 Sockliner Sits Atop New Full-Length Comfordry™ Lasting For The Ultimate In Cushioning And Comfort.