The Vionic Tide thong sandal has the APMA Seal of Acceptance Podiatrist-designed, bio-mechanical Tri-Planar Motion Control footbed Lightweight, flexible EVA midsole for shock absorption Soft woven toe post and foam-lined strap Deep heel cup to stabilize, support and realign feet back to their natural position APMA seal of acceptance Recommended by Dr. Andrew Weil Vionic Women's Tide II