Pint Jacket is a cardboard insulated sleeve designed specifically to fit a standard pint glass. The Pint Sleeve was invented by Frank L. Mayer in 1997. Also known as Pint Jacket, Pint Glass Sleeve, Pint Sleeve pintsleeve.com While working with J.J. Taylor Distributing jjtaylor.com in Key West, FL. Mayer observed patrons wrapping napkins around pint glasses because of condensation on the pint glass. [1] [2]