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Image: Safety 1st, from safety1st.com. Colors may differ from the seat you buy. See it on safety1st.com
An all-in-one car seat with 3 modes: rear-facing harness 5 to 40 lb, 19 to 40 in; forward-facing harness 30 to 65 lb, 34.4 to 49 in; belt-positioning booster (high-back) 40 to 100 lb, 43.4 to 52 in.
$129.00on safety1st.com, as of 2026-10-07 05:49 UTC. Prices change.
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The TriFit (CC407) is an all-in-one seat: rear-facing from 5 to 40 lb and 19 to 40 in., forward-facing with the harness from 30 to 65 lb and 34.4 to 49 in., and a booster from 40 to 100 lb and 43.4 to 52 in. It has a 3-position base and a one-hand headrest, and expires after 10 years.
It suits a family that wants a straightforward all-in-one with a one-hand headrest and harness and a manual that covers aircraft use. The trade-off comes at booster time, when the harness straps are pulled out of the shoulder slots, unthreaded from the chest clip and buckle tongues, and tucked behind the seat pad. The TriMate (CC408) lists the same ranges, but its page links no manual and gives no expiry or aircraft status.
A research summary of Safety 1st’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. Safety 1st 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 | 19 to 40 in | Not published | — |
| Forward-facing harness | 30 to 65 lb | 34.4 to 49 in | Not published | — |
| Belt-positioning booster (high-back) | 40 to 100 lb | 43.4 to 52 in | Not published | — |
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.
Safety 1st does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying.
Borderline, Smokey Camo, Twinkle.
Install rear-facing with either the lower anchor belt or the vehicle belt, not both. The belt goes under the pad, across the seat, in front of the buckle and out the other side of the rear-facing belt path. For a child who cannot sit up unassisted, the Rear-Facing Level Line must be parallel with the ground using Position 2 or 3. A child who can sit up may ride more upright in Position 2. Position 1 is not allowed rear-facing. The optional body pillow is for rear-facing only and slides out from behind the harness straps.
Source: TriFit All-in-One Convertible Car Seat user guide (PDF)
Forward-facing and booster modes use Position 1, fully upright. The manual gives the vehicle belt with the tether for a child up to 65 lb, or the lower anchor belt with the tether for a child up to 55 lb. Above 55 lb, the vehicle belt is required. The tether must always be attached when an anchor is available. Harness mode ends at 65 lb, 49 in., or when the child no longer meets the forward-facing fit checks.
Source: TriFit All-in-One Convertible Car Seat user guide (PDF)
Before booster use, the harness must be stored and the accessories removed, except the cup holders. The manual's steps: remove the harness covers, take the strap loops off the splitter plate, pull the straps out of the shoulder slots and unthread them from the chest clip and buckle tongues. Then raise the headrest, rethread the straps, tuck them behind the seat pad and remove the buckle. The child rides with the vehicle lap and shoulder belt only, LATCH stored, and the booster must not be used if the tops of the ears are above the headrest.
Source: TriFit All-in-One Convertible Car Seat user guide (PDF)
The pad comes off without removing the harness system; leave the straps threaded in the hip slots. Machine wash the pad and accessories separately in cold water on a gentle cycle, no bleach, and tumble dry separately for 10 to 12 minutes on low heat. Spot clean the harness and buckle. The cup holders are top-rack dishwasher safe. The seat must not be used more than 10 years after the date of manufacture. It is certified for aircraft with the internal harness, not as a booster.
Source: TriFit All-in-One Convertible Car Seat user guide (PDF)
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.
The manual lists 5 to 40 lb and 19 to 40 in. rear-facing, 30 to 65 lb and 34.4 to 49 in. forward-facing with the harness, and 40 to 100 lb and 43.4 to 52 in. as a booster.
TriFit All-in-One Convertible Car Seat user guide (PDF) (opens in a new tab)
The manual says not to use the lower anchor belt for a child weighing more than 55 lb. Use the vehicle belt with the tether from there to 65 lb.
TriFit All-in-One Convertible Car Seat user guide (PDF) (opens in a new tab)
The manual says it is certified for aircraft use with the internal harness, on forward-facing aircraft seats. It is not certified as a booster.
TriFit All-in-One Convertible Car Seat user guide (PDF) (opens in a new tab)
The TriMate (CC408) page lists the same ranges: 5 to 40 lb and 19 to 40 in. rear-facing, 30 to 65 lb and 34.4 to 49 in. forward-facing, and 40 to 100 lb and 43.4 to 52 in. as a booster, with an 8-position headrest and 3-position base. It links no manual and does not state expiry or aircraft use.
Safety 1st: TriMate All-in-One Convertible Car Seat (CC408) (opens in a new tab)
The manual says not to use it more than 10 years after the date of manufacture shown on the label on the side of the seat.
TriFit All-in-One Convertible Car Seat user guide (PDF) (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
Other all-in-one seats whose published weight and height limits overlap the TriFit All-in-One Convertible Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$129.99Deep Sea 2 · Amazon price as of 2026-11-02 17:40 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$139.99Price on safety1st.com as of 2026-10-07 05:49 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
| Backless booster | 40–100 lb | 43.4–57 in |
$259.99Vintage Mickey Mouse 2 · Amazon price as of 2026-11-02 17:40 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$239.98Mickey Sprinkle · Amazon price as of 2026-11-02 17:40 UTC, subject to change
