Mesh & Synthetic Leather - For a lightweight, comfortable and breathable performance fit. Rearfoot GEL - The ASICS GEL system is based on a special kind of silicon that enables optimal shock absorption. Gel units are strategically placed in the midsole and designed to enable specific functions and positions. Compression Moulded EVA - Moulded into the shape of the foot for a custom fit and long term lightweight cushioning. AHAR+ Rubber - This is a thinner and lighter version of ASICS High Abrasion Rubber. It is placed on heavy contact areas of the outsole to reduce excessive wear.