are high back boosters anchored?
TETHER STRAP: None of the high-back boosters (that weren't part of a combination seat) currently come with a tether strap. LOWER ANCHOR STRAP: Most booster seats do not come with lower anchor connectors – however, some do. ... The following high-back boosters allow the use of the lower anchors: Clek Oobr – rigid LATCH.