Nothing to do really with rainbows, but we thought a fun definition from Urban Dictionary would make it more interesting:
50 dollar sandals that last longer than others, because the dude who made them was tired of seeing cheap sandals littering the oceans because they wear out so fast. they are either composed of a leather or hemp (your choice)and in different colors (dark brown, light brown, black, etc) and have either thin straps or thick straps. they come in single, double, and even triple layers. Are often affiliated with rich people who can afford them.