Synthetic Rubber sole BIOM NATURAL MOTION technology for a snug fit, along with stability and forward momentum for power during the swing PHORENE midsole - made with ECCO FLUIDFORMDirect Comfort Technology - is soft, light and provides bounce and energy return Waterproof membrane keeps foot dry and comfortable in wet weather FTS 3.0 receptacles with Pivix spikes are combined with additional grooves on the outsole for superb traction and stability Removable and washable Ortholite insole supplies long-term cushioning