The phrase "seat buckles" refers to the fastening devices found in cars, airplanes, and other vehicles that hold passengers securely in their seats to keep them safe during a journey.
«The simple, compact Fisher - Price Healthy Care Deluxe Booster Seat buckles to an adult chair and makes for a versatile travel chair or a spare chair to keep at Grandma's house,» writes Erica Pearson at Wirecutter. (thetoddle.com)
They've created a unique yet simple solution: a hole to put the stroller seat buckle through that keeps the blanket in place and two Velcro straps to hold it conveniently off the ground while not in use. (ourfamilyworld.com)