Isabel Marant Billyo Sneaker in White. - size 37 (also in 36) Isabel Marant Billyo Sneaker in White. - size 37 (also in 36) Cow leather upper with rubber sole. Lamb leather lining. Lace-up front. Perforated detail. Made in Portugal. IMAR-WZ45. BK0342-20A012S. The pioneer spirit - During the brand's early days, a unique silhouette is born: the contemporary Parisian girl. Products that became iconic, simple yet effective. The brand is ahead of its time, with an outsider state of mind, always a bit off the road.