Having recently had a fall and broken wrist when wearing cheap wellies, I needed something better. Delighted with my MuckBoots. I have quite chunky calves, but they fitted well. I measured my feet as 6 and 6.5 - I thought rounding up to 7 would be too big, so ordered 6, and glad I did - they fit perfectly, and the neoprene tops are very comfortable. They give a very positive grip on mud, sludge, algae and snow. I'm putting them on even to just pop out to the woodshed and compost bins.