Jobst Anti-Em Knee-Hi Large-Long (toe: Purple)(pair) - White Knee-Hi. Calf Circumference: Large Circum. 15 -17.5 Toe Color : Purple. Leg Length: Lg Long Length: 17 -20. Specifically designed to combat thromboembolism. Latex Free. A convenient opening is located on top of the foot so the skin will never touch the floor.