NoJo - Rainbow Mini Crib Sheet. These cute rainbows will brighten your day and provide a happy space for your little one. Shades of spa blue, soft pink, rose and yellow on a white background make this 100% polyester microfiber fitted mini crib sheet vibrant and cheerful. Measures 24 x 38 x 5" with elastic all the way around for a perfectly snug fit on any standard size mini crib mattress.