Purple.4 and Tulo belong to the same product category. For a medium-firm feel, they are excellent choices. These beds are flippable. These two mattresses can easily fit on adjustable bed bases. If you like quilted foam, you may prefer these popular sleep surfaces. US residents can enjoy hassle-free shipping on both beds. These models come with an exceptional warranty. You can avail bed-in-a-box facility with both products.