XS: Back length 20 CM S: Back length 25 CM M: Back length 30 CM L: Back length 35 CM XL: back length 40 CM XS (recommended weight 1-1.5 kg) S (recommended weight 1.5-2 kg) M (recommended weight 2.5-3.5 kg) L (recommended weight 4-5.5 kg) XL (recommended weight 6-7 kg)
