Footwear, Shoes and Boots Design Wiivv Custom Fit Sandal Custom Fit Footwear from you Smartphone by Christopher Bellamy Wiivv's award winning smartphone app captures customers biometric foot data and generates a biomechanically optimised sandal design. It is 3D printed in San Diego California and shipped to the customer within 14 days. Using the customers foot data, the sandal's arch support is printed unique to them, and the straps placed in custom locations. The triple density foam footbed, deep heel cup, biomechanically data driven design, no rub toe thong construction, custom strap placement and custom arch support make it the most comfortable sandal on the market, without compromising aesthetics.