adidas Women's Marathon Tr 10 Running Shoe 100% Mesh and synthetic Synthetic sole Midsole Material: Torsion System--The Torsion System creates stability and control and provides midfoot support. Outsole: adiWEAR--A non-marking rubber outsole compound offering abrasion-resistance and durability. Cushioning Technology: adiPRENE+--Cushioning material that retains natural propulsive forces for greater forefoot efficiency. adiPRENE by adidas technology keeps you moving. This innovation gives you forefoot resiliency and shock absorption at the heel. Heel Technology: adiPRENE--Maximizes heel protection and stability; is located under the heel to provide extra protection from harmful impact forces. Model Number: G21776