A stylish silhouette with functional elements is what makes the Rockport Gryffen Penny Slip On a worthy addition to your weekend-ready closet. This sneaker has Strobel construction for forefoot flexibility and a TR outsole for better shock absorbency. The EVA with memory foam cushioning insole conforms to the shape of the foot, giving you personalized comfort. Strobel construction. EVA with memory foam insole. TR outsole. Fit: True to Size. Insole: EVA/Memory Foam. Outsole: TR. Upper: Canvas.