
When using some belt positioning and backless boosters, the seat belt holding your child in place may not hold him or her snug enough. That's where the Seat Snug comes in.
This device attaches to the seatbelt near the locking mechanism and keeps the lap belt snug while still allowing movement in the shoulder region.
Watch a demonstration of how it works here:
It took me a bit to install the Seat Snug on my daughter's seat belt. But once I figured it out it went quickly and is easy to use. I felt like it did make her safer when using a high back belt positioning booster that didn't have the LATCH system.