Acavallo Opera Stirrup
 
The Opera stirrup is a completely new concept in riding because of its special patented loop construction, which allows the stirrup to adhere to the saddle flap, avoiding friction between the leg and the stirrup.  This gives a more correct, comfortable and secure ride as the stirrup hangs with perfect balance, angle & flexibility.
 
The large laser cut stainless steel stirrup pad gives riders better grip and relieves tension in the hips, knees, ankles and calves. The foot plate is supported by twin moulded side sections made of composite material in injection.  Each side works independently, spreading load & absorbing shock. 
Opera Stirrups - Size Guide
Refer to the diagram in the article images and use the chart below
 
Size
A
B
C
One size
13cm
15cm
11.5cm