This is a double-strap buckle sandal, commonly referred to as a Birkenstock-style sandal or slides. The design features two adjustable straps with buckles, a contoured footbed, and an open-toe structure for comfort. Brands like Birkenstock, Dr. Scholl’s, and other footwear companies produce similar styles. The sandal in the image appears to be from a brand called “Solu Shoes,” as seen on the insole.