Download free PDF Step by step guide 1.INSTRUCTIONS Cushion measurements: 2 pieces 82 x 122 cm. for top and bottom, 2 pieces 27 x 122 cm. for border, 2 pieces 27 x 82 cm. for ends.2.Sew an inner bag with the same measurements and place a long concealed zipper along the side so the outer fabric can be removed and laundered.3.Fill the cushion/inner bag with polystyrene foam pellets, using approx. 250 litres.