An Indoor High-Low frame is an excellent and versatile option! The Stingray seating system slides off the stroller base and is mounted on the High-Low Frame. Gas strut allows for smooth movement from high to low positions. The frame allows for 40 deg. of tilt. (Recline is still possible as it is a function of the seating system). Size 1 adjusts from 6 1/2" - 23 1/2" base plate for floor. Size 2 adjusts from 9 3/4" - 23/ 3/4" base plate to floor.