Stylish and easy to coordinate, the Pikolinos Rotterdam Knee High Boot will become a go-to. This lace-up sneaker features a cushioned insole that ensures all-day comfort. Ankle strap detail Side zipper Leather and textile lining Cushioned insole Style number: 902-9641. Size: 37 M. Color: Black Calfskin Leather. Gender: Female. Age Group: Adult.