XS:  suitable for less than 2kg,  15cm lace,   15cm straps on both sides

S:  suitable for less than 3.5kg,  20cm lace,  15cm straps on both sides

M:  suitable for less than 6.5kg,  25cm lace,  15cm straps on both sides.

L:  suitable for less than 12.5kg,  30cm lace,  15cm straps on both sides