After sectioning your hair, start combing at the ends and comb closer to the roots each time. When you have completed each section, twist it or braid it. This will prevent the hair from 'shrinking' and matting while preserving some length.
When you have combed through all of your hair, or after it is dry, take out the braids/twists and fluff it.
Also, great for beards! Beards can grow to be incredibly tough and if you happen to relax on the upkeep, it can get particularly gruelling trying to comb through one. Even if your facial hair happens to just be slightly thick, a long-toothed comb is a fantastic tool to dig deep and effectively relieve knots - particularly within the tricky area underneath your chin.
A long-toothed comb is a fantastic tool to dig deep and effectively relieve knots - be it within the hair on your head or the end of your chin.