Ryka Aqua Shoes [HYDORO SPORT] Popular Aquazumba Model; Aqua Fitness, Aqua Walking; The new upper is integrated with the shoe tongue for improved holding and smooth removal. Mesh upper for lightweight, excellent breathability and quick drying - Through insole, midsole, and outsole for easy drainage - Notch on forefoot to keep flexibility and also on running; TPU plate for improved motion control.