The Spanky G6 features a Pour-In G6 Polyurethane Midsole in a Cupsole Construction. The outsole tread is our Triangle Tread built and designed to last longer and have more grip while the insole features Spanky's custom illustrated artwork. For a better fit, The Spanky G6 includes Lycra Tongue Stabilizing Straps and also has Whip Stitch Heel Detailing.