Extra Extra Small – Height: 550 mm / Leg support opening width: 180 mm / Recommended user weight: 12-17 kg|Extra Small – Height: 680 mm / Leg support opening width: 200 m / Recommended user weight: 17-25 kg|Small – Height: 800 mm / Leg support opening width: 270 mm / Recommended user weight: 25-50 kg|Medium – Height: 920 mm / Leg support opening width: 320 mm / Recommended user weight: 45-95 kg|Large – Height: 980 mm / Leg support opening width: 400 mm / Recommended user weight: 90-165 kg|Extra Large – Height: 980 mm / Leg support opening width: 520 mm / Recommended user weight: 160-240 kg|Maximum user weight: 300 kg