The britax discovery sl is a lightweight high back booster seat suitable from around 4 12 years that utilizes the isofit system with soft latch connections for quick and simple installation features forward facing installation from 15kg to 36kg installation 3 point seat belt installation installation isofit with soft latch impact protection deep softly padded side wings harness 3 point car seat belt seat adjustable backrest for perfect fit with any car direction of travel forward facing simple