Men's Johnston and Murphy McGuffey S/O Slip-On Shoes The Johnston and Murphy MCGUFFEY S/O is a stylish and versatile shoe crafted with premium materials and superior construction techniques. The upper is made from soft and supple leather that is both comfortable and durable. The shoe features a slip-on design that makes it easy to put on and take off, while the elastic goring on the sides ensures a secure and snug fit.