A Puffy 90s Style Inspired by the Past, But Built for Today The Toddler Knu Skool Elastic Lace is a modern interpretation of a classic 90s style, defined by its puffed up tongue and 3D-molded Sidestripe, and tied off with elastic laces. With its in-your-face profile and dramatic style details, the Knu Skool plays off of the original Old Skool while blending an icon of the past with today’s trends.