I made for my son stroller liner. Perfec for summer. You will need: 1 piece 50x65 cm of top stretch fabrics 1 piece 50x65 cm of bottom stretch fabrics water resistant fabric foam 1/2" (1cm) - 50x65 cm or Style-Vil needle scissors
I used this foam upholsterysupplyonline.com/products/Sew-Foam-1%7B47%7D2%22.html (I didn't buy on this site). Or you can use Style-Vil. 1/2" (1 cm) wide.