DESIGNED BY MR PORTER. Mr P.'s 'Peter' Derby shoes are designed to look a little more relaxed than classic styles, so they'll work with a range of smart and casual outfits. They're crafted from supple suede and set on thick rubber soles for a sportier feel. Lower Impact Materials. This product is made using at least 50% lower-impact materials or ingredients. Find out more about our Consciously Crafted criteria here.