The Spectana is PUMA?s most stable trainer, and also offers one of the most comfortable rides on the market. Maximum stability comes from the patented M2D+ medial support technology. It?s a lightweight, unrestricted, and self-tuning material design that works like corrugated cardboard ? the inner waves combine structural rigidity with superior cushioning when and where you need it. For maximum cushioning, PUMA has lined the Spectana with full-length IdCELL and a dual layer OrthoLite X40 sockliner. Plus there?s a few millimeters more blown rubber in the forefoot to guarantee a comfortable ride. Built on the widest platform PUMA offers, with some of the best cushioning available, the Spectana is a perfect match for runners seeking a comfortable everyday stability trainer.