The outsole of the anatomic footbed on this style features a unique, colorful work of art by Hawaiian artist and Rider ambassador Colleen Wilcox. The Rio's contemporary design also features a thin, patent upper. Rider makes some of the most popular casual sandals available, and millions worldwide adore them. Thoughtfully designed and beautifully durable, Rider sandals and thongs are made to conform to your foot, cushion every step, and accommodate your natural gate. Material: Synthetic.