An update to a perennial favorite, this new upper offers perforation for added breathability and comfort with the core ingredients BIOM Hybrid fans have always loved. - Yak leather - is extremely strong so we can cut it thinner, which makes it more breathable to keep your feet dry and comfortable. The supple leather melts around your feet for a buttery soft fit and feel. - BIOM anatomical last - we scanned the feet of 2,500 people to design an upper that fits the contours of your feet for out-of-the-box comfort. - BIOM anatomical last - we scanned the feet of 2,500 people to design an upper that fits the contours of your feet for out-of-the-box comfort. - ECCO HYDROMAX - 2 year waterproof warranty - a patented waterproofing system designed to keep your feet dry and comfortable by keeping water out and moving the heat and moisture out too. - Direct-Injected TPU (Thermoplastic Polyurethane) outsole - we are the only golf footwear brand to use this and can last up to 5x longer than rubber. - E-DTS (ECCO Dynamic Traction System) patented outsole design - up to 100 spikes and up to 800 different traction angles are designed to lock you into the turf for excellent traction in all turf conditions.