I've been commuting for about 12 years and always wore my Keen shoes. Just started going longer distances and am trying out a new pair of HiTops to save my Keens, which I wear all the time. Not securing your feet to the pedals doesn't seem to be very popular in the cycling world but I found this interesting article that pretty sums up how I feel.

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These are my pedals,

VP Bicycle Components

Cheers