S (knee circumference 30-33cm)(suitable weight 80-120kg) M (knee circumference 33-36cm)(suitable weight 120-150kg) L (knee circumference
Color classification:
Black and Gray 2 anti-skid breathable black and red 2 anti-skid breathable black and green 2 non-slip breathable orange 2 installed non-slip breathable black Gray 2 installed Silicon