S [Width：47cm]

Suitable for washing machine Width < 47cm

M [Width：55cm]

Suitable for washing machine Width 48-55cm

L [Width：60cm]

Suitable for washing machine Width 55-60cm

XL [Width：65cm]

Suitable for washing machine Width 60-65cm

If you don't know to choose which one size, can consult the seller, tell the seller the type of washing machine.