What type of latch plate can slide up and down the webbing?

A sliding latch plate is designed to move up and down along the webbing, allowing for adjustments in the positioning of the harness. This feature is particularly useful for ensuring a proper fit for the child as it provides the flexibility to modify the harness height according to the child's growth. The ability to slide helps in making quick and effective adjustments to accommodate changing needs without having to remove or reinstall the entire restraint system.

In contrast, a sewn-on latch plate is permanently attached to the webbing and cannot be adjusted, which limits its use in providing a customized fit. The dynamic latch plate typically refers to systems that respond to forces during a crash event, enhancing the safety features but not allowing for vertical adjustments. Lastly, a fixed latch plate remains in a single position and doesn’t offer the versatility of height adjustment that the sliding latch plate provides.