This lightweight popular GT-2140 is the newest addition to the Asics 2000 range of running shoe, evolving from the 2100, 2110, 2120 and the 2130 models. The Gel-2140 has been design for moderate over-pronators who run long distances, particularly 10k and marathon as well as roads and treadmills. Although the Duo. Max Support System that ensures proper support has remained the same, the stability has been enhanced through the midsole tooling and the space trusstic system has been lengthened slightly and more pronounced on the medial side offering more rigidity and preventing over-pronation. The AHAR heel maintains durability at the back of the shoe and helps the Durasponge rubber forefront in cushioning the foot throughout the running motion. The EVA sockliner has been replaced with a 5.5mm Ortholite Comfor. Dry sockliner, comprising of one-density memory foam material providing a cushioned platform feel and reforms itself after every run.Upper:Air mesh. Synthetic leather. Personal Heel Fit3M Reflective.Sole:I.G.S.Solyte midsole. Duo. Max. Visible Rearfoot GELForefoot GELSpace Trusstic. AHAR+ heel. Dura. Sponge rubber Forefoot.Features:Solyte 55 lasted. Removable Comfordry sockliner. Gender specific midfoot design.Weight: 255g