Breathable Stretch Knit Upper Dual Density EVA and Memory Foam Footbed Adjustable Velcro Back Strap Shock Absorbing Rubber Outsole Lightweight Construction Experience total comfort in the Biza Shoes Kona. With a fully adjustable Velcro backstrap and a sporty silhouette, this comfort sandal makes travel a breeze. The dual density EVA and memory foam footbed cradle the foot in total comfort while the rubber outsole absorbs shock with every step.