Gently Used meaning it has dog hair in it! No damage to the product and never been in a crash. I've changed how I crate my dog and no longer use it. No harness included. PupSaver brand harness recommended for use. Crash tested, rear-facing design will catch your dog upon impact and act as a protective barrier to prevent contact with hard surfaces. For use with most dogs up to 30 lbs. Between sizes? Measure your dog using specs below as a guide. Five total seatbelt-grade plastic clips (reversible for use behind driver and passenger seats) lock PupSaver in place and integrate with seatbelt pretensioner in case of an accident to pull PupSaver safely over your dog. Full polyfill throughout Additional stitching, reinforced nylon backing at all attachment points. Heavy-duty metal j-hooks for lower LATCH (child safety seat) anchors in the back seat. New all-metal tether attachment system provides security at the base of the seat. Can be used in the front or back seat. Can double as a pet bed while traveling. Original PupSaver (all colors) - 24" (interior width - the part your dog sits on) / 28" (*exterior width at widest point) x 18" (seat bottom depth) x 16" (seat back height) *Please measure your car’s seat before purchasing.PupSaver Seats are COMPLETELY constructed of ballistic nylon. There are no hard foam pieces (like a booster seat), so the PupSaver is somewhat flexible. We very rarely encounter a vehicle which cannot accommodate an Original Size PupSaver. Weight = 7 lbs.