Product Price Weight (lbs) Height Limit (inches) Weight Limit (pounds) Seat Width (inches) Booster Backrest Height (inches) Harness System
Chicco Fit3x ClearTex All-in-One Car Seat
US
£169.88 21.0 57 in 100 lbs 16.7 in 20 in 12-position no-rethread harness

The Chicco Fit3x ClearTex is a slim all-in-one car seat measuring 16.7 in wide and weighing 21 lbs. It supports rear-facing, forward-facing, and high-back booster use for children from 5 to 100 lbs, with ClearTex fabric, six recline positions, and fold-in CupFolders.

★ Ideal for

It suits small cars because its 16.7 in ultra-slim width is designed for three-across seating, while its high-back booster mode accommodates children 40-100 lbs and 44-57 in tall.

Diono Radian 3RXT SafePlus 3-in-1 Convertible Car Seat
US
£258.51 30.6 57.1 120 17 5-point harness

The Diono Radian 3RXT SafePlus is an all-in-one car seat that supports rear-facing, forward-facing harness, and high-back booster use from 4 to 120 lb. Its 17 in slim-fit design is made for fitting three car seats across, while SafePlus side-impact protection, an anti-rebound bar, and a 12-position headrest support growing children.

★ Ideal for

It suits small cars because its 17 in slim-fit width is designed for three-across installation, while its 4-120 lb range and high-back booster mode allow one seat to serve from infancy through the booster years.

Graco True3Fit LX 3-in-1 Car Seat
US
£206.08 49 or less; 43-57 in booster mode 5-40 rear-facing; 26.5-65 forward-facing; 40-100 booster 16.5 No-rethread 5-point harness

The Graco True3Fit LX is a 3-in-1 seat that supports rear-facing, forward-facing, and highback booster use. It has a slim 16.5-inch width, a forward-facing belt lock-off, an anti-rebound bar, and a no-rethread harness, making it suitable for growing children and three-across installations.

★ Ideal for

Its 16.5-inch width and highback booster mode from 40-100 lb make it a strong option for small cars and families needing a compact 3-in-1 seat.