Manmade Imported Rubber 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. ComforDry Lasting – Seamless Construction – The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams. Trusstic System technology – Reduces the weight of the sole unit while retaining the structural integrity of the shoe. Solyte Midsole Material – A lighter weight midsole compound than ASICS standard EVA and SpEVA midsoles. Also features enhanced cushioning and durability.