Stuart Weitzman does a lot of research on arches and the gradient of the heel to make sure that even really high heels are comfortable. Also had great insoles.
Many owners of the boots have complained that they don't stay up above the knee. Even when the shoe size is correct, they are too baggy to be comfortable (especially around the ankle).
There is a lycra panel down the back of the calves of these boots to give them some stretch to pull on. They are perfect if you have larger calves as it will comfortably stretch around your leg shape.