Sized to fit over a twin mattress at 79" x 39", this canopy turns an ordinary bed into an enclosed space without any change to the frame, and it works equally on the floor. Two windows keep air moving and let a parent see in. Brushed fabric over fiber poles is soft against skin and machine washable when it needs cleaning. At 3 lbs it goes up and comes down in minutes. For ages three and up; assembly required.