The BIOM Golf Hydromax's uppers are designed with a combination of Hydromax™ and Yak leather. Yak leather is 3x stronger than other leathers, and Hydromax™ leather provides water and stain resistance. The combo offers lightweight comfort and durability, while still maintaining the breathability of the shoe to keep feet cool and dry.
4 of the Summer Series' styles have mesh uppers that enhance the shoes' breathability and that also stretch to give the feeling of a custom fit (#98951, #98975, #98968, #98854). The remaining 3 styles feature full grain leather uppers that provide excellent comfort, durability and breathability, as well as some water resistance (#98944, #98899, #98842).