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Spark R&D Binding Size Chart

  USM USW EUR CM
XS / S   5 - 8.5 35-39 22-25.5
Small <8 <8 <40 <25
Medium     8-10.5     7-11.5 40-43  25-27.5
M / L   9-11 40-43.5 26-28
Large 11+ 12+ 43.5+ 28+