Using this night sky fitted sheet is easy. Just place it over your mattress and tuck the elastic - banded edges under the mattress for a snug fit. When it gets dirty, simply toss it in the washing machine. However, make sure not to use bleach or dry clean it, as this can damage the fabric and cause it to fade. To keep it looking its best, wash it in cold or warm water on a gentle cycle. Also, be aware that the color you see on your screen might be a bit different from the actual sheet because of monitor settings.