Design: Performance knit fabric with 3-layer no sew upper for an overall incredible fit and feel Water resistant fabric and coating for optimal speed through the water 2-way grip heel liner, multi-directional texture that allows the foot to slide in smoothly to shoe and provides grip when exiting the shoe for a non-slip experience while wearing In-Shoe Comfort: Mizuno enerzy insole for superior fit and cushioned insole for high performance Mizuno enerzy core new advanced midsole material, delivering the most resiliency and softness, it will help enhance performance Durability & Traction: Mizuno c-flex outsole technology using a lightweight, rib construction, as well as a symmetric stud arrangement for enhanced stability, flexibility, and traction, while also providing increased comfort with reduced stud pressure