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Price on Amazon.com as of 2026-11-02 05:03 UTC, and subject to change.
An all-in-one car seat with 3 modes: rear-facing harness 5 to 40 lb; forward-facing harness 26.5 to 65 lb, up to 49 in; high-back booster 40 to 100 lb, 43 to 57 in.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Graco SlimFit3 LX is a 3-in-1 seat Graco lists at 16.7 in wide. It is used rear-facing from 5 to 40 lb, forward-facing with the harness from 26.5 to 65 lb, and as a high-back booster from 40 to 100 lb for children 43 to 57 in tall. It has no backless mode and expires after 10 years.
It suits a family fitting three seats across a back row, or using a narrow car. The manual has a chapter on three-across installs, and Graco lists the seat at 16.7 in wide and 19.2 lb. The trade-off against the 4Ever DLX is no backless booster mode and fewer recline positions, 4 against 6, with Graco listing the DLX at 21.5 in wide.
A research summary of Graco’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 3 stages, and a child has to meet every limit of the stage they are in. Graco gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Rear-facing harness | 5 to 40 lb | Not published | Not published | Head must be at least 1 in below the headrest adjustment handle |
| Forward-facing harness | 26.5 to 65 lb | Up to 49 in | Not published | — |
| High-back booster | 40 to 100 lb | 43 to 57 in | 4 years | At least 4 years old |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
At 16.7 in at its widest, this seat is one of the narrower ones in its class and is a candidate for three across in many mid-size cars. It weighs 19.2 lb, which matters if you will move it between cars or carry it through an airport.
Katrina, Kunningham.
The manual recommends the vehicle belt over the lower anchors for three-across, since lower anchors fix the seat in one place and many vehicles lack them in all three positions. It suggests buckling all three belts first to judge the fit, installing the center seat first, and putting the rear-facing seat in the center. If cup holders get in the way, remove one. Seats can touch but should not overlap, and each should move less than 1 in at the belt path. An infant carrier next to it must be attached to its base at all four points each time.
Rear-facing uses one of two rear-facing recline positions and forward-facing one of two forward-facing positions. The booster goes in the 4th position. Lower anchor connectors fit vehicles with 11 in (28 cm) anchor spacing, and LATCH is not used forward-facing for a child over 45 lb. For a forward-facing belt install, the lap and shoulder belt both go under the lock-off, and the manual says you then do not need to switch the retractor. In booster mode, LATCH is allowed only if the vehicle maker permits it, and the tether must then be used.
Rear-facing, the top of the head must be at least 1 in below the headrest adjustment lever. Forward-facing, the straps sit at or just above the shoulders and the ears stay below the top of the headrest. The head and body supports are for children under 20 lb, rear-facing only. The headrest pad unsnaps from the shell, and the seat pad uses 6 snaps. Pads machine wash cold on a delicate cycle and drip-dry, with no bleach. Cup holders must come off before the front seat pad.
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
Rear-facing is 5 to 40 lb, forward-facing with the harness 26.5 to 65 lb, and high-back booster 40 to 100 lb for a child at least 4 years old and 43 to 57 in tall.
No. The manual describes rear-facing, forward-facing and a high-back booster only. The booster ends at 100 lb.
Graco lists it at 16.7 in wide, 20.7 in deep and 24.5 in tall, with a product weight of 19.2 lb.
Graco lists the 4Ever DLX at 21.5 in wide and 23 lb, with four modes including a backless booster to 120 lb and 6 recline positions.
Yes, but only with the internal harness, on a forward-facing aircraft seat and without the tether. It is not certified for aircraft as a booster.
Graco says to stop using it and throw it away 10 years after the date of manufacture.
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| SlimFit3 LX 3-in-1 Car Seat (this seat) | 100 lb | 19.2 lb | 16.7 in | 10 years |
| Extend2Fit Convertible Car Seat | 65 lb | 19 lb | 19.5 in | 10 years |
| Contender Slim Convertible Car Seat | 65 lb | 16 lb | 18.9 in | 7 years |
| Extend2Fit 3-in-1 Car Seat | 100 lb | 20.61 lb | 19 in | 10 years |
| Extend2Fit 3-in-1 Car Seat featuring Anti-Rebound Bar | 100 lb | 21.9 lb | 19 in | 10 years |
| 4Ever DLX 4-in-1 Car Seat | 120 lb | 23 lb | 21.5 in | 10 years |
| 4Ever DLX Slim 4-in-1 Car Seat | 120 lb | 27.5 lb | 18.9 in | 10 years |
| 4Ever DLX Grad 5-in-1 Slim Car Seat | 120 lb | 24.1 lb | 18 in | 10 years |
| 4Ever 4-in-1 Convertible Car Seat featuring TrueShield Technology | 120 lb | 24 lb | 21.5 in | 10 years |
| 4Ever Extend2Fit 4-in-1 Car Seat | 120 lb | 25.99 lb | 21.5 in | 10 years |
| Grows4Me 4-in-1 Car Seat | 110 lb | 22.5 lb | 21.5 in | 10 years |
| SlimFit 3-in-1 Car Seat | 100 lb | 19.47 lb | 19.9 in | 10 years |
| SlimFit LX 3-in-1 Car Seat | 100 lb | 21.5 lb | 19.9 in | 10 years |
| TriRide 3-in-1 Car Seat | 100 lb | 18.45 lb | 19 in | 10 years |
| TrioGrow SnugLock 3-in-1 Car Seat | 100 lb | 18.92 lb | 19 in | 10 years |
Other all-in-one seats whose published weight and height limits overlap the SlimFit3 LX 3-in-1 Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
$229.99Silas · Amazon price as of 2026-11-02 05:03 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
$229.99Price on gracobaby.com as of 2026-10-07 05:47 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 22–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 4–40 lb | Not published |
| Forward-facing harness | 26.5–65 lb | Up to 49 in |
| High-back boosterfrom 4 years | 40–100 lb | 43–57 in |
| Backless boosterfrom 4 years | 40–120 lb | 43–57 in |
$319.99Maddox 2.0 · Amazon price as of 2026-11-02 05:03 UTC, subject to change
