I also purchased the "Beacon Thunder Slip-on" at the same time that I purchased these duck shoes.  They do NOT fit the same way.  They feel quite tight, unlike the other Beacon shoes I purchased.  They are cute with jeans, however.  And after wearing them a few times, they have loosened up a bit.  Maybe there's a break-in period for them?  ...the Thunder Slip-On did not have  a break in BTW.  Overall decent shoe.  However, don't know that I would purchase again.