ECCO BIOM G2 BOA Men's Golf Shoe - Navy/Red - GORE-TEX Waterproof technology combines optimized breathability & protection against the elements - Yak leather uppers, extremely strong & lightweight for increased breathability and durability - BIOM NATURAL MOTION technology brings the player closer to the ground using an anatomical last by studying how the foot moves - BOA closure system engineered for ideal fit and comfort, quick lacing and easy adjustment - Champ Slim-Lok receptacle system and Zarma spikes offer reduced weight and easy replacement