As the name suggests, the mid crew socks in the middle of the lower leg tend to extend to about half of the man's lower leg, while the mid socks above the lower leg are completely above the lower leg and the knee is just below the knee. The mid calf crew socks in the middle of the calf are longer than the crew.
Mid Crew Socks are usually knitted in the middle of the calf or the entire calf length.