Winter Equestrian Tall Riding Bootsb- size 36 / women's 6. I think these are Ovation, but can't find a brand marking. Worn lightly for 2 winters; still plenty of wear. My daughter outgrew them. Repaired loose stitching on calf pad on one boot. Shaft is approx 14 inches on the sides, 13 inches behind the knee. Calf width is approx 15 inches measured at the widest point.