Fold over 1 cm of the fabric and sew and one end. Then repeat on the other end.
Double the fabric by folding it in half, leaving a 25 cm border along one end.
Fold it over again...
Then sew the sides of the fabric together so it becomes like a huge pillow case. Turn it inside out.
And you’re done! Just put the mattress into your new creation. When you’re done relaxing we like to store them away by rolling them up and keeping them tight with a string or belt to store away.