You use a cleat to climb a tree and your hair gets the same coloring as the foliage because your hair is like a chameleon. The coloring of your hair changes to whatever color is around you, so you use your cleats to climb trees to make your hair turn green and brown, and in the fall, yellow and orange and red!
This cool coloring can only happen because you turned yourself into a cyborg (さい). Your hair and scalp are now made of high tech parts, not human ones.
Currently there are no similar looking kanji which exist in the WaniKani learning system