3D AirMesh channels through seat and backrest. Quick-release LATCH connectors and SuperCinch one pull tightener. ErgoBoost Plus seat with 3 layers of foam padding. Zip on cushioned leg rest. 2-Position backrest. Backrest is removable to create a backless booster. EPS Energy absorbing foam surround head and torso. Bonus kid console. For children at least 4 years and 38-57" tall. High back mode fits kids 30-100lbs. Backless mode ideal for kids 40-110lbs. Machine washable fabrics.