Harmony Defender 360 booster seatBooster type: Combo seat with harness.

Weight: 22-65 lbs with harness, 30-110 lbs as belt-positioning or backless booster.

Price: $119

IIHS rating: Best bet.

NHTSA ease of use rating: Three out of five stars (either mode).

Pros: Most affordable harnessed booster on market. No-rethread harness. Narrow width. LATCH.

Cons: Crotch strap is too short, say some users. Heavy.

Comments: Canadian car seat maker Harmony offers one harnessed booster in the US, the Defender 360°, which is sold by Walmart for $117 and Amazon, albeit at a slightly higher price, $130 (on Harmony’s web site, the list price is $170).

The Defender features a no-rethread harness, EPS foam, one-hand recline and side wings for side impact protections. And yes, there is one cup holder.

A big advantage to this seat is its narrow width (17.5″), which is just a touch wider than the Diono Radian convertible seats. This may allow three across seating in some vehicles.

Another big headline here is the price: at just $117, this seat is the most affordable harnessed booster on the market as of this writing. And a no rethread harness to boot! The Defender ships with LATCH and tether strap hook. It covers to a belt-positioning and then backless booster.

Parent feedback on this seat has been positive—most parents are happy with the ease of use, price and durability of the Defender. Critics say the crotch strap is too short. Another negative: this is a rather heavy seat at 22 lbs., so it isn’t the best choice for carpools.

Final note: Walmart lists this on their site as a convertible seat (rear and forward-facing); that isn’t accurate. This is a forward-facing only harnessed booster for kids over the age of 2.

Overall, we would recommend this seat as a good alternative to the Graco Nautilus.

Rating: A-