Storm Sox White Grey The Storm Sox uses a flexi cage system to give added heel support over HEYDUDE\'s signature styles. The bi-component stretch knit upper material, padded comfort lining and ultra grip sole makes for a perfect secure form-fit for your whole foot. Includes leather-lined, memory foam insoles with antibacterial properties. Features: Stretch knit material Regular fit Ridgelight sole unit Weight 195grms Ultralight outsole Leather-lined, removable anatomic insole