Latex is commonly used for seat cushion foams, for those who like the feel, assed durability or desire to avoid having polyfoam in their sofa. Savvy Rest just came out with a line of sofas using latex, offering them in a “plush” or “firm” latex, but they do not list their ILDs. Just like a mattress it is something you’d want to try out before ordering to see if you liked the comfort. On our component post, both kttenterprises and foamorder offer latex block cushions.