The So Kate iconic pump with timeless elegance brilliantly combines discretion and sophistication. Its all black patent calfskin features a sculpted upper that extends its lines to the iconic bold cut. It sits easy atop a slender 120 mm heel to give you confidence, underlining Maison Christian Louboutin know-how. Size 41.5, which is 11-11.5 in US sizing. I normally wear a size 10, but these do run smaller and fit me perfectly.