They're crap. Perhaps I should expand a little... Since these are about £8, I took a punt and ordered a pair. Shoes that arrive like this show promise: However, once I had them on, my fears regarding the toebox were proven to be correct: Ouch. Despite the material being incredibly thin, they just wouldn't conform around my toes. They aren't just narrow like smart dress shoes, they're even worse. I couldn't stand to have them on my feet for more than 5 mins sitting at my desk, despite them being a little oversize, by the looks. Another thing you might have noticed is that I'm wearing socks with them. This is because the material is so far from breathable, I could tell that my feet would be dripping with sweat in minutes. Oh also, they smell extremely strongly of freshly moulded rubber/plastic. I was about to write that I could not find a single redeeming feature of this shoe, when I remembered the thing that made me first click on the link... they're biodegradable! I'm off to chuck them in the compost right now... Nothing ventured, nothing gained!