A puffy 90s style inspired by the past, but built for today The Knu Skool is a modern interpretation of a classic 90s style, defined by its puffed up tongue and 3D moulded Sidestripe, and tied off with oversized, chunky laces. With its in-your-face profile and dramatic style details, the Knu Skool Shoes play off of the original Old Skool while blending an icon of the past with today’s trends.