You need :
- A board of the width of your mattress or a little more. (Here we used a board of 65 inches by 20 inches for a queen size mattress)
- An old duvet
- Red fabric
- Black buttons (shank buttons)
- A solid thread
- Two little boards to make feet
- Four screws
- A drill
- A stapler
- A needle
Staple and verify that it is stretched out well, that there are no folds.
The staples mustn't be thicker than the board, otherwise they would poke through.
Do the same with the red fabric, so everything is hidden.
The needle is homemade too, it's an umbrella rib, sharpened so that it pricks.
It's easier with two people.