Amazon.com : Evenflo Spectrum 2 in 1 Booster Seat, Ergonomic Seat Base Amazon.com : Evenflo Big Kid AMP Booster Car Seat, Sprocket : Child Amazon.com : Evenflo Spectrum 2 in 1 Booster Car Seat, Cornerstone : Baby Evenflo Spectrum Review Car Seats For The Littles Evenflo 2 in 1 booster car seat Matthews Auctioneers Evenflo Revolve180 LiteMax NXT Accessory Base Evenflo Official Site. The Evenflo Spectrum 2 in 1 Booster Seat is the solution that hard working parents have been looking for. The Spectrum 2 in 1 serves as a no back and high back booster. It features nine height adjustment positions that enable it to support your growing child longer. This kids booster seat includes LYF+GUARD Advanced Compression Technology, which combines multiple layers of energy absorbing materials that compress upon impact, reducing risk of injury. The Evenflo Spectrum booster seat has been developed with an ergonomic seat base that fits a broad range of children. This helps make the seat comfortable and safe at the same time. Our Spectrum 2 in 1 booster is designed with two built in cup holders that are durable and easy for children to grasp. Machine washable materials are used that are easy to remove.