I use them for musical theater, on a variety of surfaces (from rehearsals to performances). I have high arches and occasional plantar fasciitis so I need good support in flats and between the firm sole and dual strap my feet don't hurt like other flats I've tried. I don't find the strap/buckle position adjustable but the shoes fit me well so I'm happy anyway. I'm a 9 in regular shoes, on the narrow side of the M, and the shoes 9-9.5 are perfect in length and width.
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