Thigh clip-on strap

This item is sold per unit, 

• Small fits a thigh circumference of 15.5" - 19" (39.37cm x 48.26cm)
  
• Medium fits a thigh circumference of 18" - 22" (45.72cm x 55.88cm)
  
• Large fits a thigh circumference of 21" - 29" (53.34cm x 73.66cm)