I bought two of these (Small) to wear over bandages for lymphedema - they are roomy enough for my foot + padding + bandages, but adjustable enough that they stay on when I just have a sock. (I normally wear a women's size 7 or 7.5.). Because the shoe is so open, it hasn't caused any pressure issues on my feet, which has been a problem with other shoes. There is a tread pattern on the bottom so the shoe does get some traction, (I have not put these through any strenuous activity, though.) I've been wearing these daily for about a month, and found that they were a great solution for me.When sizing, it's important to remember that these are designed to go over a cast or bandages, so they are very roomy by design - and there is no "left" or "right", so they are pretty much the same width along the foot, so they can accommodate either foot shape. There are other sites that list measurements, and other commenters have also noted these - the Small fits up to a 10" long foot (the shoe itself is a bit longer), 4" wide.There is an X-Small size available, but if the measurements from other sellers online are correct, the 9" length and 3.5" width would be a bit too small for me - especially if I had anything bulky on my feet. (It looks to me like each size is 1" larger, 0.5" wider than the one smaller - but I can't confirm as I only own the Small size.) For those concerned with sizing, it appears that the manufacturer (Darco) is making a newer model that includes actual length measurements - but that shoe is a different design than this one, so there's no way to know if those sizes will apply to this.I kept my rating to four stars, though, because the "adjustable" stops that hold the elastic in place (these are light grey on the model of the shoe that I purchased) are made of very soft plastic... it is very easy to strip out the plus-shaped holes on the inner part of these stops (this is the part that unscrews to loosen the grip on the elastic - you can use a large Phillips head screwdriver to loosen and tighten, as long as the holes aren't stripped). On the second pair I bought, all six of these had been overtightened and the holes stripped completely - I needed two sets of pliers and some elbow grease to convince these to loosen their grip and let me adjust the length of the elastics.A little difficult for me to put on or slip into, but very comfortable for a cast shoe with a very firm sole.I wear a size 8 shoe so I bought the medium. First off, hard casts are rather bulky, so the shoe could have been wider with long laces. The length was perfect, though. Putting the shoe on is a bit of a challenge due to the very snug fitment. Walking is a total breeze. I have been recommending it to everyone I know.Sizing is challenging because it requires a Phillips screwdriver to turn the plastic bolts that are inside the gray buttons holding the elastic laces...and the rubber of the shoe is stiff, making it hard to reach inside with a tool and not be pushed back outside by a flap! ;-)But the main point of my review is to comment on size. The manufacturer needs to list these by length, not by shoe size, because they are meant to be worn over a cast or post-op shoe. Let a person measure their cast foot, then order by inches (width is little to no concern--huge width). I wear a 9.5 wide shoe (men's or women's, depending upon athletic or dress). The small cast shoe fit my sock-clad foot with 1/4 inch or so to spare. But no prayer of putting my WL post-op shoe inside it, even with all the laces removed. It just was not too long. Mind you, my toes hang over the front edge of the post op shoe. I ordered the M cast shoe and am returning the small, though I had to pay more than $5 return shipping and buy the M at a higher price to get it by Prime in two days. But I am flying in three days and want my broken toe protected during travel.My doctor fitted me with a walking boot as I recover from Achilles surgery. I am in this boot for 3 months. I wanted something to protect the bottom of the boot when I went out to do yard work, etc. This shoe works perfectly. I was fitted with a size Medium (Mens) size boot. It took me two tries to get the correct size Darco Body Armor Case Shoe. Ultimately I had to get a size X-Large. Mostly, it is the width of the walking boot that wouldn't fit in the size Large Darco shoe. One note: there is a bungee cord adaptor that helps you tighten the Darco shoe around your ankle, but it doesn't help tighten the two bungees across the front of the foot. I had to find out how to tighten those from another user-the instructions are not provided by Darco (I deducted 1-start for this). Where the bungee attaches to the shoe, on the inside of the fastener there are slots in the fastener that fit a Phillips screwdriver. Loosen the connector, pull the bungee to the correct tension, then retighten the fastener. By the way, this shoe seems to be of good quality materials, I will certainly expect it to last 3 months, if someone else has to wear it daily then expect it to wear out in 6 months.I ordered this Cast Sho as an overshoe to balance out my legs while wearing a walking boot on the other foot. While it does help, I found that this height was a pinch TOO HIGH for my walking boot, pretty much shifting some of my weight from my RIGHT (uninjured foot) to my LEFT (injured) foot. Not cool. I've experimented with different height sneakers on my good foot and that has helped, but I still feel a slight imbalance. That being said, its still MUCH better than the large imbalance experienced prior to ordering this product.Now for the bad part. I ordered originally from What a Deals, they said my size was in stock, yet they sent me two sizes too small. And it was the weekend, so no replacement until the following week. I reordered from a different supplier, and paid for overnight shipping, but felt I needed it promptly, so I paid up. Amazon kindly reimbursed me for the overnight shipping expense, and I appreciate that. The new supplier, Rhino Power Sales, shipped the same day and was received the following evening.***** Rhino Power Sales* What a Finds