All FloorSitters feature integral abductor, hip positioning strap and quick release H-belt. The exclusive Tumble Forms coating makes them attractive and easy to wash and maintain. Tumble Forms seamless covering is washable, odor and stain resistant, impervious to urine, and nontoxic. The Small and Medium sizes have updated anti-thrust seats for increased pelvic stability. Shoulder harness slots allow 4" of vertical adjustment of the shoulder strap The Small Feeder Seat and Floor Sitter fits most toddlers age 2 to 5. The Medium Feeder Seat and Floor Sitter fits most children age 3 to 8 The Large Feeder Seat and Floor Sitter fits most adolescents age 8 to 13 years The X-Large Feeder Seat and Floor Sitter fits most youth and adults age 13 to 20 years and older.