Clek Olli is for 40-120 pounds and over 4 years old. It is a very nice backless booster. One of the things I love most about it, is it has LATCH. When used with LATCH, you don't have to worry about remembering to buckle the seat when not in use, and you don't have to worry about it becoming a projectile in a crash. Olli has a quick release strap for easy removal. Pull the strap and LATCH releases.
The Olli's cover is easily removable for quick cleaning or changing to a different color. It is also treated to resist stains, which makes cleaning spills so much easier.
Where backless boosters are concerned, I really love Olli.
This child is 7 years old and 48 pounds. She fits quite nicely in Olli.
This child is 9 years old. She too fits quite well in Olli. She looks and feels squished in several other backless boosters, but is quite comfy in this one.