I took a chance on this model because the 520 model no longer is sold, at least that I can find. This model is taking me some time to get used to since there is a "rocking" motion due to the support cushion in the shoe. The support is good though and the wide width option is great for me because I have flat feet and plantar fasciitis. I would recommend these to anyone looking for good support and have need to wide width options.
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