What is the Carrier Waistbelt Extender & Lumbar Support and how do I use it?

All Ergobaby carriers are ideal for heights of 5'2"/157.5 cm to 6'2"/188 cm and go from 26 in/66 cm to 55 in/139.7 cm in waist. The Carrier Waistbelt Extender & Lumbar Support provides extra length to your carrier for greater comfort and a more inclusive fit. It adds approximately 6 in/15.2 cm to your carrier’s waistbelt. It is compatible with Ergobaby carriers that feature a lumbar support, including Omni, Aerloom, Adapt and Original (manufactured after 2017). Note: It is not compatible with Embrace, Alta Hip Seat, Lift Hip Seat, Away Carrier, or Ergobaby Doll Carrier.