These are long engineer boots made with genuine leather on both the outside and inside. The uppers are made of sturdy genuine leather, and the inside is lined with genuine leather, providing good breathability and comfortable wear for long periods. • Material (Outer): Genuine Leather • Inner: Genuine Leather Lining • Shaft Height: Approximately 37cm • Shaft Circumference: Approximately 37cm • Ankle Circumference: Approximately 32cm • Heel: Approximately 6.0cm *Measurements are based on size 36. Due to manual work, there may be an error of approximately ±0.5cm.