Extra tall at 50cm and extra long at 150cm this bed rail is suitable for mattress height between 13 to 30cm. Ideal to bring along when travelling with children. Please note: this is a fall protection for your child, not a climbing protection. The bed rail is suitable for mattress height between 13 to 30cm. It is not suitable for waterbeds and bunk beds (max. Height above ground 60 cm).