I am in love, I repeat IN LOVE, with my chaise lounge! Besides the fact most chaises are much smaller and not nearly as comfortable, also for 5x the price. It is an actual mattress. I would assume similar to cot sized when in lying position. The only difference is it has a wood frame at the bottom of mattress/cushion, like most furniture. Has very nice structure and many springs (for those of you with a bad back) plenty of padding, and the adjustable headrests is a major bonus! I also love the lumbar roll, you can put it to the side and use it as an armrest if you like. I'm just amazed at the quality of this piece of furniture and the minimal price compared to every other chaise I looked at...... I have been looking for a very long time and could not find one of this size or quality, especially for its great price. Very very happy and recommend highly