Vionic Pacific Rio - Women's Adjustable Platform Sandal. The platform gets an upgrade with Pacific Rio, a beach-ready slide with three adjustable straps across the vamp. A metal buckle detail brings both function and style to this classic silhouette, which adds just the right amount of height. Natural Alignment with Vionic's Biomechanical Footbed. The orthotic-grade footbed supports your feet from the ground up.