Very comfy, I have found them great on long walks through the mud. I sized up to allow room for cosy insoles and welly socks and they fit really well. Great to have space for my generous calves! The clips though don't always seem to stay fastened, so the boots get looser at the top throughout a walk or I have to re-clip them. Also, they really smell! A sort of copydex glue smell, it was very overpowering when I opened the parcel and I had to leave them outside. It was so strong that I got some charcoal filled pouches to store in them to try and absorb it, and after I have worn them I have to put my socks straight in the wash. It does seem to be improving quite quickly but is still quite unpleasant nonetheless. One more niggle - please don’t supply the review form with 5 stars pre-selected if you want honest feedback!