Britax Safe-n-Sound Hi Liner SG Review





Booster Seat




Booster mode: 4-8yrs (approx.)


H 75.2-85.5 x 
W 41 x 
D 38.5 cm

Height markers



Adjustable headrest

Other features

Deep side wings for side impact protection
Tethered top strap
SecureGuard Clip to prevent submarining
Protecta Plus Harness Compatible
Arm rests
Removable, washable cover
Cup holders


5 years on Safe-n-Sound car seat moulding, harness and fittings;
2 years on softgoods supplied with your Safe-n-Sound car seat at the time of purchase (including accessories); and
1 year on Safe-n-Sound accessories supplied after you purchase your Safe-n-Sound car seat.

CREP safety rating

Protection rating

Booster mode

Ease of use rating

Booster mode​

Pros and cons


+ Very tall, height adjustable
+ Top tether
+ Anti-submarining
+ Narrow
+ Cup holders


– Expensive

Bottom line:

The Britax Safe-n-Sound Hi Liner SG is a height adjustable tethered booster seat with side impact protection wings. When fully extended, it is one of the tallest booster seats (at 855mm) and will fit the tallest of children – if not then they will very likely fit in your regular car seat anyway. Supporting this is a 5 star safety rating (on the old CREP standards) and valuable safety features: EPS wings for side impact protection in case of an accident, a top tether strap to ensure the booster remains tethered to the car, and an anti-submarining clip Britax calls SecureGuard to ensure the belt remains in the correct position.

The Hi Liner SG is a good quality seat, but at $219 has a price to match the premium features.

Who this is for:

Parents looking for a tall, tethered booster seat with additional safety features.

Not sure which booster seat is right for your child? Check out our Car Seat Selector.

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