Optimized Upper - featuring a glove-like, one-layer Jacquard Mesh and MetaClutch exoskeleton external heel counter with built-in memory foam FlyteFoam Midsole Technology - Our FlyteFoam technology provides exceptional bounce back and responsiveness no matter the distance, utilizing organic super fibres to help reduce packing out that traditionally happens with softer, low density foams. I.G.S (Impact Guidance System) Technology - ASICS design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. Ortholite Sockliner - Moisture management (Ortholite is a registered trademark of ATP Manufacturing LLC). Heel Clutching System Technology - Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Colour: blue