LUCID 4 Inch Folding Mattress – Full XL Size Price:  $139.99 (as of 18/10/2017 12:23 PST- Details)

This folding foam mattress doubles as a sleeper and a chair, providing comfortable seating and serving as a convenient guest mattress in one
Perfect to use for sleepover guests, camping, cabins, dorm rooms and children’s playrooms
Use as a mattress topper, portable cushion, and guest bed as a great alternative to futons, bunk beds and trundle beds