Engineered mesh upper: Wraps the foot with a soft feel while improving breathability. ASICS LITE rubber is lighter, stronger, and more sustainable than standard outsole rubbers: Outer Material: Synthetic Sole: Rubber Closure: Lace-Up Heel Type: Flat Shoe Width: medium AHAR outsole rubber: Improves durability. 3D SPACE CONSTRUCTION feature: Improves compression at footstrike. Rearfoot and Forefoot GEL Technology Cushioning System: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. The GEL-NIMBUS 24 shoe offers advanced impact protection for your distance training. Creating a softer landing in every step, this shoe is also approx. 20g lighter than the previous version. The upper’s soft engineered mesh and flexible midfoot panel make these shoes more comfortable during long runs. By moving seamlessly with your foot, they help your stride feel smoother in every step. FF BLAST PLUS cushioning keeps the shoe lightweight while providing a softer feeling underfoot. This material also helps increase the shoe's rebound properties at the toe-off stage.