Unisex Oofos OOriginal Sandal | Marathon Sports。The OOFOS Unisex OOriginal Thong Sandal is the iconic silhouette that launched the recovery footwear movement. Built as a true unisex design from entirely closed-cell foam, this minimalist flip-flop uses patented technology to maximize joint relief and accelerate muscle recovery, making it perfect for post-workout transitions, long shifts, or daily wear. OOfoam Recovery Tech: Proprietary closed-cell foam absorbs 37% more impact than traditional shoe materials to significantly reduce pressure on your feet, knees, and lower back. Patented Arch Support: Anatomically contoured footbed cradles and supports the arches, reducing energy exertion in the ankles by up to 47%. Friction-Free Toe Post: Supple, single-piece foam construction features a soft, seamless toe post that prevents rubbing and chafing. APMA Approved & Washable: Awarded the APMA Seal of Acceptance for promoting good foot health, this moisture-resistant sandal is 100% machine washable.