ASICS Women's GEL-Dirt Diva 4 Track And Field Shoe 100% Synthetic Rubber sole Solyte Midsole Material A lighter weight midsole compound than ASICS standard EVA and SpEVA. Also features enhanced cushioning and durability. Rearfoot GEL Cushioning System Attenuates shock during impact phase and allows for a smooth transition to midstance. Integrated Lacing System