Hehe, you sure can. I can't guarantee how long they'll last as have only had mine a few weeks but they have kept my feet lovely and cosy in the minus temperatures and for £8.50, they're an excellent buy even if they only last a few months.
I would say they come up on the bigger side for width at least - my feet are only really a 6 in length but I basically always have to buy a 7 because my feet are so so wide. In these boots however a 6 is just about right for me, they are quite spacious on the width.
Been toying with the idea of these for a while: don't own my own horse, but my riding boots still aren't comfy or that warm for pottering about in the yard. Thanks for making my decision for me - warm, comfy and well priced made my mind up!