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I 1/8 of a yard (4 in) of 4 in foam. 4in foam is like $50/yard which at first turned me off, but when you only buy 1/8 of a yard and use a 40% off coupon it only cost about $5 and I was able to get 6 4in cubes. It doesn't take much fabric to cover them so to save a little money I raided my mother-in-law's fabric scraps for some brightly colored textured fabric. I tried to get lots of different textures so the blocks could be used as a learning tool for my then 9 month old. To cut down on the sewing I cut a 4.25 in by 12.5in piece of fabric and 2-4.25in pieces of the same fabric then I sewed the pieces together in a cube shape leaving on seam undone stuffed my 4 in cube inside and hand sewed up the final seam.