Classic slip-on shoes with practical stretch inserts for a quick on and off, a crocodile pattern at the heel and a breathable insole that ensure an optimal foot climate, ideal for a smart or casual look. Brand: Rieker Upper: Leather Lining: Synthetic Insole: Leather Sole: Synthetic. These Rieker Colorado mens slip on shoes feature easily accessible and smart leather uppers that sit atop the formal shoes, perfect for everyday wear. The mens black slip-on shoes are smart and practical with a wide fit and a smooth black leather upper which is breathable and comfortable. There are stitching accents over the toe cap and heel back for added structure and the stretchy side gussets offer easy slip-on access and comfort. The stitch construction sole unit is flexible and breathable and the separate heel maintains the smart appearance of these shoes.