The Sleep Adventure 4" cooling mattress is composed of a 3" HD base foam and topped with 1" of visco gel infused memory foam. This mattress is covered in a soft, breathable, stretch knit fabric. Firmness rating is 7.2 on a industry scale of 10: feel is medium firm. The mattress is perfect for bunks, trundles, and hideaway couches. All Sleep Adventure products are proudly made in America using CertiPUR certified foams - ensuring that our products meet standards for emissions and toxins. You can rest assured that you are getting a healthy nights sleep without breathing harmful chemicals or fiberglass.