Just like you, Ariat's Fatbaby boot is a pretty performer. Cool contrasts and stitch detailing offer a fresh take on Western style, while ATS technology delivers lightweight stability and cushioning. Additionally, its Pro Crepe outsole was designed to easily slip in and out of stirrups. These are the women's Fatbaby Cowgirl with premium full-grain leather with cowhide shaft as well as the Ariat exclusive Pro Crepe light outsole with Duratread heel. They also have a 30 percent thinner outsole than Ariat traditional crepe outsole. leather. Rubber sole. Shaft measures approximately 8" from arch. Heel measures approximately 1.5" Platform measures approximately 0.5" Boot opening measures approximately 12" around. Performance riding boot.