Spark R&D Binding Size Chart

 USMUSWEURCM
XS / S 5 - 8.535-3922-25.5
Small<8<8<40<25
Medium    8-10.5    7-11.5    40-43.    25-27.5    
M / L 9-1140-43.526-28
Large11+12+43.5+28+