1 / 1 Image from Graco
Image: Graco, from gracobaby.com. Colors may differ from the seat you buy. See it on gracobaby.com
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.
$229.99on gracobaby.com, as of 2026-10-07 05:47 UTC. Prices change.
Buy from Graco (opens gracobaby.com in a new tab)Sold by Graco. Not an affiliate link; this site earns nothing from it.
The Graco SlimFit LX 3-in-1 is an all-in-one seat used rear-facing from 5 to 40 lb, forward-facing from 26.5 to 65 lb up to 49 in, and as a highback booster from 40 to 100 lb and 43 to 57 in from age 4. It adds myPocket storage and a RapidRemove cover, and expires after 10 years.
It suits the same family as the plain SlimFit, with fabrics that are easier to get off: Graco says the Rapid Remove cover comes off in 60 seconds without uninstalling the seat or removing the harness. Limits, the 19.9 in width and the 4 recline positions match the SlimFit. Graco lists this one at 21.5 lb against 19.47 lb for the SlimFit. The pockets add a step at installation, since the belt must not lie on top of them.
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 19.9 in at its widest, measure your back seat before counting on three across. It weighs 21.5 lb, which matters if you will move it between cars or carry it through an airport.
Lilac, Shaw.
The manual splits the fabrics into a headrest pad, lower seat pad, front pad, side pad and top pad. The lower seat pad unsnaps from the side pad and pulls up off fastening strips; the others come off with snaps, elastic straps, loops and tabs. Each is machine washed in cold water on a delicate cycle and drip-dried, without bleach. The myPocket pockets snap to the armrests, are not interchangeable, and are not required to use the seat. Do not put sharp objects or anything over 1 lb in them. The harness, lower anchor and tether straps are surface wash only.
Rear-facing, use the blue belt path and recline position 1 or 2, with the level indicator ball fully in the blue zone and at least 80% of the base on the vehicle seat. For a belt install, lift the seat pad to reach the belt path, flip the myPocket pocket out of the way, buckle and lock the vehicle belt (in most vehicles by pulling the shoulder belt all the way out and letting it retract), then tighten. Forward-facing uses the orange belt path, recline position 3 or 4 and the tether. Lower anchors are not for a child over 45 lb and need vehicle anchors 11 in apart. The seat should move less than 1 in.
The headrest and harness adjust together. Rear-facing, the head must be at least 1 in below the headrest adjustment handle; forward-facing, the top of the ears must be below the top of the headrest. The infant head and body supports are only for children under 20 lb. In booster mode the harness is stored inside the seat, the seat goes in recline position 4, and the child is held by the vehicle lap and shoulder belt. LATCH may hold the booster in place up to 100 lb. Never use a lap-only belt.
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 with the head at least 1 in below the handle, forward-facing is 26.5 to 65 lb up to 49 in, and the highback booster is 40 to 100 lb and 43 to 57 in for children at least 4.
Graco SlimFit LX 3-in-1 Car Seat product page (opens in a new tab)
Graco says the Rapid Remove cover removes in 60 seconds without uninstalling the seat or removing the harness. The seat pad is machine washable.
Graco SlimFit LX 3-in-1 Car Seat product page (opens in a new tab)
The manual says not to place sharp objects or objects weighing more than 1 lb in them. The belt or lower anchor strap must not lie on top of the pockets.
It is certified for aircraft when used with the harness on a forward-facing aircraft seat. It is not certified as a booster because aircraft have no shoulder belts.
Yes. Graco lists the regular SlimFit 3-in-1 at 19.47 lb, with the same 19.9 in width and the same mode limits.
Graco SlimFit 3-in-1 Car Seat product page (opens in a new tab)
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 |
|---|---|---|---|---|
| SlimFit LX 3-in-1 Car Seat (this seat) | 100 lb | 21.5 lb | 19.9 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 |
| SlimFit3 LX 3-in-1 Car Seat | 100 lb | 19.2 lb | 16.7 in | 10 years |
| SlimFit 3-in-1 Car Seat | 100 lb | 19.47 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 SlimFit 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 2026-11-01 12:10 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 |
$299.99Kunningham 2.0 · Amazon price as of 2026-11-01 12:10 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 2026-11-01 12:10 UTC, subject to change
