How does the moon shrink and swell? Well the truth is, the moon is constantly growing but every month the moon trimmers work very hard to shave it back down so it doesn't get too big for its britches and bump into Earth. Made on the moon by said moon trimmers, the Welcome Triger 8.5 Moontrimmer Skateboard Deck ensures gravity-free ollies, the floatiest airs, and effortless flip tricks.