ASICS Women's GEL-Nimbus 14 Running Shoe 100% Synthetic-and-fabric Rubber sole Solyte midsole material with EVA and SpEVA foams I.G.S. Impact Guidance System enhances your foot's natural gait from heel strike to toe-off Rearfoot and Forefoot GEL Cushioning Systems P.H.F. Personalized Heel Fit dual-layer memory foam collar Biomorphic Fit stretch material strategically placed on the upper helps to reduce buckling and the potential for irritation