It comes in 4 pieces,  which made it somewhat easy to put on. However,  the arm pieces were not tak enough to cover at the way to the bottom on the chair I bought this for. I did have to use elastic straps (for sheets to stay on mattress) on the seat portion because my chair is a leather recliner. The friction from sliding the back & seat would cause the cover to pull off of the seat. The elastic bands worked to keep it on.