FR1 / FR3 / FR2 / FRX:
34-37 = S
38-40 = M
41-44 = L
45-47 = XL
S : Strap composed of a male part in S and a female part in S — Ladder Strap 150mm
M : Strap composed of a male part in M and a female part in M — Ladder Strap 150mm
L : Strap composed of a male L-shaped part and a female L-shaped part — Ladder Strap 150mm
XL : Strap composed of a male part in XL and female part in L — Ladder Strap 120mm
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