Sirolo is Oliver Sweeney's great new version of Osimo. The iconic Osimo has been your favourite for many years, so there has really been no reason to change it…Until now. Oliver Sweeney have found a new super lightweight polyolefin compound for the sole - a whopping 260g per pair lighter than traditional rubber… and even harder wearing.Sirolo is our iconic Italian trainer on a lightweight sole, produced at our artisan factory in Le Marche. The dark navy calf leather upper has clean lines with folded facing seams and is fully leather lined with a cushioned leather insock.100% Leather.Made In Italy.