The phrase "red seatbelts" refers to the color of safety belts or straps in a vehicle that are used to keep people secure while driving. Full definition
The RS5 also comes with the RS design package that introduces red accents for a bit of contrast, where you'll find red stitching on the steering wheel, gear lever, door cards, along with red seatbelts. (paultan.org)
The standard Cup wheels can also be ordered in five finishes / colors, and you can add red seatbelts if you desire. (automobilemag.com)
Equipment levels were sparse, but a red interior carpet and three - spoke steering wheel - with a set of red seatbelts - gave off the correct vibe. (evo.co.uk)