ASICS Hypergel-Sai Women's Running Shoes Black/Pink Glow : Enjoy Energy Without Limits in the ASICS HYPERGEL-SAI(TM) cushioned running shoes. Unlike others out there, these shoes feature a modern, fresh take on the traditional running footwear we know. With an asymmetrical lacing system and MONO-SOCKA(R) Fit System, runners will find a look and fit thats truly unique. Hyper GEL provides runners with impressive responsiveness and shock absorption that lasts for miles. Upper: Features a MONO-SOCKA(R) Fit System that is an elastic internal sleeve which replaces a traditional tongue, providing a sock-like fit. Features a unique asymmetrical lacing system. Midsole: Features built-in Hyper GEL, which is a combination of eTPU and ASICS signature GEL cushioning technology for a responsive, yet cushioned feel. Outsole: AHARA(R) ASICS High Abrasion Rubber placed in critical areas provides exceptional durability.