No unnecessary bells or whistles. Just pure, peaceful relief with every step. Featuring a seamless circular knit upper with Zen bands that hug heel and instep, and the advanced OOmy footbed with Oofo’s proprietary OOfoamâ„¢ technology that absorbs impact like no other. Zen is balance: mobility, pliability, lightness, power, integrated into a shoe made to move the way your body moves.