Twin XL Size 39 in. x 80 in. Sometimes a mattress needs a slab of foam to either make it more comfortable or to extend the life of the mattress. Many times, a mattress can be an odd size which will make the mattress expensive or difficult to find or both. We have slabs of foam, custom cut to your size mattress. Our foam is high quality, medium density (2.8), which will help give your mattress a medium firm feel. It is also fire resistant, and top upholstery grade. This is the same foam that you might find inside your higher end sofa and mattress. This is NOT visco foam that sinks to your impression, weight and heat. This foam is firmer, with much less compression. The color of our foam is generally white but it sometimes comes in a slightly different shade such as light pink. The color is not in our control. The foam slab goes on top of your mattress, then your mattress pad (or the opposite) and your fitted sheet goes over the combination. There you go, a bed almost like new!.