Made of hard wearing canvas with leather on the inside to protect the canvas from scuffing when walking. They are shaped to fit snugly on your boot with a hook to attach to the bottom lace. An eyelet on each side to take a cord to hold them down if you are wearing elastic sided boots. The back has velcro and domes to open up to get them on and then hold them in place. There is elastic at the top to fit snugly around your ankle to help prevent mud etc getting inside.There are two sizes, small and large. Small fits boot sizes from 6-8. Large 9- 12.