Our exclusive; extra firm Chelsea Mattresses are specially designed for use with daybeds; trundle beds and pop-up trundles. Layers of padding; including 15mm of latex; for extra comfort overlay a steel innerspring with a heavy duty wire and full foam border. Quilted premium knit fabric cover. Quality and value makes this your perfect daybed or trundle bed mattress solution. Available in 33" daybed or 39" twin sizes.