Rag & Bone Mercer Knee High Boot in Black. - size 40 (also in 37, 37.5, 38, 38.5, 39, 39.5) Rag & Bone Mercer Knee High Boot in Black. - size 40 (also in 37, 37.5, 38, 38.5, 39, 39.5) Leather and textile upper with synthetic sole. Inside partial zip closure. Leather lining with OrthoLite ® footbed. Approx 75mm/ 3 inch heel Approx 393mm/ 15.5 inch shaft Shaft measures approx 11.77 in circumference. RGBR-WZ338. RP0D25H516U. rag & bone is rooted in a dedication to craftsmanship, innovation and timeless style. Each collection is designed in New York and developed through the time-honored techniques of some of the oldest and most supremely skilled manufacturers from around the world. Since the brand's origins in 2002 the focus has been, and always remains, on creating the highest quality goods.