While sailing on the Long Island Sound, inventor and sailor Paul A. Sperry slipped on the deck of his boat and fell overboard. He was able to pull himself back on board, but the experience drove him to develop a non-slip shoe for boating. While experimenting, he noticed his cocker spaniel's ability to run down an icy hill without slipping. Examining its paws, he noticed traction-enhancing grooves, which he sought to mimic by cutting a pattern of them into a natural rubber sole utilizing a process known as siping.[1][2]
