There are 3 versions
- Avento (ref. 15607)
- Avento HighLow with central brake (formerly known as Fero HL) (ref. 13590)
- Avento HighLow with individually braked castors without cover cap and footrest (ref. 15610)

The Avento has a fixed seat height of 53 cm, while the Avento HighLow seats are adjustable in height thanks to a hydraulic pump:
- Avento HighLow with central brake: 53 to 83 cm (seat height)
- Avento HighLow with individual brakes: 49 to 79 cm (seat height)