Because I have a significant disparity in size between my two feet (L>>R) finding one pair of shoes that fits both feet is problematic.  I'd previously bought a pair of 'Foamtreads Men's Physician Slippers' (evidently both indoor/outdoor but more like bedroom slippers IMO) which work fine and are very comfortable but are constructed differently than the 'Men's Doctor'.  I'd also tried a pair of 'Propet Men's Cronus Sneakers' but the amount of velcro overlap on my left foot prevented them from staying on securely.  I had contacted Foamtreads and a very nice customer service lady suggested the 'Doctor's' construction would likely be insufficient.  But after having the 'Cronus' refuse to stay on my left foot while out in public, I took a chance on the 'Doctor'. Happy to say, that while there's a fair amount of non-contact velcro area, it's sufficient to stay on my foot securely.  Beyond that, they're pretty comfortable too and feel like a real outdoor shoe... so, long story short... I like 'em, a lot!