Synthetic sole 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. Trusstic System technology – Reduces the weight of the sole unit while retaining the structural integrity of the shoe. Heel Clutching System?Technology – Exoskeletal heel counter provides improved support and creates improved heel fitting environment. Ortholite X-40 Sockliner – This premium sockliner features higher rebound properties while providing excellent moisture management and a high-level of breathability (Ortholite is a registered trademark of ATP Manufacturing LLC.) Solyte Midsole Material – A lighter weight midsole compound than ASICS standard EVA and SpEVA midsoles. Also features enhanced cushioning and durability.