Unlike traditional laces, this lacing system allows you to dial in for a more precise and consitent fit. ECL™ or "Extreme Comfort Leather" is a new proprietary waterproofing system developed with Pittards® of England. It is a membrane-free leather with a 2-year waterproof warranty. ECL Advanced Waterproof Leather is 30% softer than previous generation FootJoy performance leather. FootJoy warrants that this golf shoe will be waterproof in normal use for two years (U.S. Warranty). Leather linings provide superior comfort and in-shoe breathability. GelCollar is a visco-elastic gel molded to match the shape of the ankle. The technology provides additional comfort and support around the collar. GelCollar also contains IntelliTemp™. This technology stores heat away from your foot, keeping you cool while you play. Full rounded toe character, standard fit across forefoot and instep, with a slightly narrow heel. The Laser Last is a composite of thousands of digital scans of the FootJoy Laser Fitting System. Varying densities of TPU (thermoplastic urethane) are strategically placed throughout the outsole for stability, flexibility and walking comfort. The OptiFlex forefoot flexibility channel is softest density of TPU (thermal plastic urethane) used in tri-density TPU outsoles. OptiFlex produces unparalleled walking comfort and flexibility.