holding fast to toe clips?

i’m no speed demon. the extent of my exuberance extends from the top of the bridge to the bottom. other than that, i’m in the slow lane looking at the city. as an avid supporter of nyc based products, i’m quite excited to see that Hold Fast is a Brooklyn foot strap manufacture. while they cater to “freestyle” cyclist, i’m wondering if these suckers will hold up to my dress shoes and flip flops…