Dynamicush Technology These classic ballerinas have a secret – high-rebound cushioning tech hidden in the 'flat soles'. These classic ballerinas have a secret – high-rebound cushioning tech hidden in the 'flat soles'. These ballet flats will have you in a whirl. Looking like classic ballet flats but feeling like the comfiest shoes ever – you'll wonder just where we fit our comfort tech. Think genius design: sleek featherlight midsoles, anatomically contoured to support your feet, with our Dynamicush technology hidden in the forefoot for 'bouncy' all-day cushioning.