A coloring blanket is a soft throw with line art printed on it, ready to be filled in with fabric markers. Many come in a size of about 59 x 50 inches, with markers packed alongside.
There is no rule about where to start: one flower tonight, a corner of the pattern tomorrow. Because the blanket is wide, two or three people can work on it at the same time.
Many designs are printed as white outlines on a black background, which gives a stained-glass look once colored. Large open areas go faster; small detailed zones take longer but look striking when finished.
What makes these blankets different is the washable ink. With water-based washable markers, manufacturers state that the color comes out in a regular machine wash, so the same design can be colored again. Always follow the care label on your blanket.
If you want to keep a finished piece, fabric markers with permanent ink are the opposite choice: what you draw with them stays. Just keep track of which areas were done with which ink.
Some simple habits make it easier. Lay the blanket flat on a table rather than on your knees, and put the caps back on the markers between sessions. A quick test on an edge shows how strong each color looks on the fabric.
Adults often use it as a quiet, screen-free way to unwind in the evening, much like an adult coloring book. It is also a common gift idea for the holidays, since it is useful long after the coloring is done.