Reebok Women's Fuel Gym Low-W 100% Synthetic Rubber sole Synthetic/Mesh Upper - for comfort, fit and durability. IMEVA (injection-molded EVA foam) midsole - for firm yet flexible cushioning High-abrasion rubber outsole - For enhanced traction and durability. FuelFoma heel cushioning - For exceptional cushioning. Forefoot flex grooves - allow extreme flexibility and give you the freedom of movement you need.