I have suffered with Plantar Fasciitis in the past - and I was nervous going with such a flat shoe - I sized up to a size 7 to be able to insert my orthotics - but to be honest - I have not needed them - the memory foam has been the perfect cushion. Even though I sized up - the fit is still amazing. It's like having absolutely no shoes on! I was drawn to the rose pink flats because it took me right back to my ballet days. I love them!