The Frontier combination Harness-2-Booster seat can be used for children over 100 lbs. as long as the vehicle shoulder belt guide places the belt in the proper position for the child, and the top of the child’s ears are below the top of the head restraint, and the child physically fits in the seat, and is not being used beyond its expiration date (9 years from date of manufacture).
Product Features
True Side Impact Protectiondistributes crash forces, shields from vehicle intrusion, contains the head and body, and keeps the head, neck and spine "in true" or aligned, to limit injury 
- Color-Coded Vehicle Belt Guides indicate the path and positioning of the vehicle seat belt
- Durable and Washable Cover in mature fashions for the growing child
- Energy-Absorbing Foam Liner (EPS) absorbs and distributes crash forces
- High Density Comfort Foam provides an extra layer of padding to gently cushion your child
- Front Harness Adjuster provides effortless front adjustment when loosening the harness system
- Cushioned Armrests help provide a secure fit and a comfortable place to rest tired arms
- Premium, Push-Button Lower LATCH Connectors for a quick, simple, and tight installation
- Cup Holders are designed to hold sippy cups, soda cans, and water bottles
- Harness-2-Booster converts to a belt-positioning booster seat
- Five-Point Harness makes contact with the strongest parts of the body
- Energy-Absorbing Base deforms in the event of a crash to absorb impact forces
- MSRP (USD) $279.99