I have short, wide feet. I used to have to wear bigger shoes to get the width. A D width does not get the job done. I started wearing NB about 10 years ago or so. These 577s are to replace my 576s that are not sold anymore. I ordered two pair and save one until one of the others wear out. The tread pattern is different they feel OK. I like the 576 model. I have had 6 pairs of those. I hope the 577 model does as well.