100% Natural Latex Mattress Topper - Medium - 3" King Naturally Supportive: 100% Natural dunlop latex and proven pressure relieving support. Exceptional Material: Extremely durable, and environmentally sustainable bedding material. Latex foam is hypo-allergenic and mold, mildew, and dust mite resistant. Change the feel of your mattress, or choose a 3" size to add extra support. Firmness 28 ILD - 5 lbs. / cubic ft.