Impact-absorbing OOfoam technology in OOFOS' advanced OOmy footbed geometry; 360-degree seamless knit upper developed to reduce pressure for a secure, sock-like fit, feel and flexibility; Pull tabs & engineered knit collar allow for ease of entry and effortless wearability, while zen bands across the heel and instep hug your foot for a secure fit; Rounded, cupped heel designed to enhance impact-absorption and stability with every step; Lightweight, flexible & packable for ultimate travel ability