"Harness positions" refers to the various arrangements or adjustments of straps and buckles on a safety harness to secure and protect a person in situations like rock climbing or working at heights.
This unit has multiple shoulder harness positions for a snug fit and long term usage. (babyseats.reviews)
The padding also lifts baby up a bit to make sure the lowest harness position is below baby's shoulders. (thespruce.com)
It fits a child from 4 to 35 pounds with an upfront harness adjustment and a 3 shoulder harness positions for better fit and longer use. (toptenstrollers.com)