Cybex Cloud T i-Size Infant Car Seat (with Base T)
Cybex Cloud T i-Size Infant Car Seat (with Base T) by Cybex (Cloud T i-Size Platinum)
For newborns who need to sleep properly on the drive from the airport, not just survive it.
Overview
Every family that has driven a rental car straight from arrivals knows the specific dread of buckling a two-week-old into a seat that tips them forward at forty-five degrees for the next ninety minutes. The Cybex Cloud T i-Size was built to solve exactly that problem. It reclines almost flat, both in the car and on a compatible stroller, and it was the joint test winner of the German ADAC and Stiftung Warentest child-seat test in October 2023, scoring an overall 1.7 (on the German school grading scale, where lower is better) when paired with its companion Base T isofix base.
We tested this seat the way most families actually buy it: the seat first, with the base as the serious follow-up purchase once the first post-baby paycheck has cleared. At €269.95 for the Platinum-line shell alone, plus €239.95 for the Base T, this is not an impulse buy. It is a considered one, and for the safety numbers alone, most families who can stretch to it will find it justified.
Why It’s Great for Family Travel
The headline feature is the recline. A single-hand adjustment tilts the backrest and leg rest together, so the whole shell drops toward flat rather than just the headrest flopping back. In the car this matters most on long transfer drives between airport and hotel, the kind where a newborn’s neck needs real support and not a five-degree concession. Out of the car, clicked onto a compatible stroller, the same mechanism gets close enough to flat that a napping baby barely notices the switch from wheels to chassis.
Cybex’s linear side-impact protection, L.S.P. for short, is the seat’s other genuine safety story. It is a set of energy-absorbing elements built into both sides of the shell, and Cybex states it reduces the forces transmitted to the child by up to 25 percent in a side impact. That is a manufacturer figure rather than an independently measured one, but it sits alongside the seat’s own 1.3-out-of-6 safety sub-score from the joint ADAC/Stiftung Warentest test with Base T fitted, and a 1.0 with just the vehicle’s own seatbelt. Both are strong, independently verified results.
The twelve-position headrest earns its keep too. Newborns and one-year-olds are different shapes, and being able to move the head support without re-threading the harness straps is one of those small conveniences that stops mattering the day you discover how badly you need it, at 6am, in a hotel car park, with one hand.
Real-World Use (Airport / Car / Hotel)
Airport: here is the one honest caveat worth knowing before you buy. Cybex publishes a dedicated aircraft-certification manual for its Cloud G i-Size seat; we could not find an equivalent document for the Cloud T i-Size, and an independent reviewer at Pushchair Expert lists the lack of aircraft certification as one of the seat’s real drawbacks. Practically, that means the Cloud T travels in the hold or as checked gate luggage rather than strapped into an economy seat beside you. If you specifically want a car seat that also works as an in-flight restraint, this is not that seat. As ground transport from the terminal it does its job well: the carry handle is easy to grip one-handed while wheeling a case with the other, and the shell clicks onto CYBEX and gb strollers with the matching adapter for a proper travel system through the concourse.
Car: this is the seat’s real home turf, and the Base T is what makes it sing. The base rotates the shell toward the car door for loading and unloading, so nobody is leaning across a rear seat at an awkward angle with a squirming newborn. Indicator windows confirm the ISOFIX connectors and load leg are seated correctly before you trust it with a passenger who cannot tell you if something feels wrong. If you would rather not buy the base straight away, the seat installs with the vehicle’s own three-point belt too, and it still tested at a solid 2.1 overall that way. It is simply not quite as reassuring, or as convenient, as the base.
Hotel: a capsule seat like this earns its place in a hotel room mostly as a familiar, contained spot to nap a baby who has just handled a time-zone change badly, and the near-flat recline genuinely helps with that more than most infant seats on the market manage. What we would flag: at 4.5kg for the shell alone, carrying a sleeping baby in it from car park to lobby to lift adds up on a long transfer day. It is not heavy for the category. It is just not light either, and our arms noticed on the one evening the lift was out.
Specs That Actually Matter
- Age/size range: birth (from 45cm) to approximately 24 months, max. 87cm / 13kg, per Cybex. Independent reviewers report that many children outgrow the shell by height closer to 15-18 months in practice.
- Safety standard: UN R129/03 (i-Size).
- Independent test result: ADAC/Stiftung Warentest, October 2023: 1.7 overall with Base T fitted (Safety 1.3, Handling 2.2, Ergonomics 1.9, Pollutants 1.0); 2.1 overall on the vehicle’s own seatbelt with no base (Safety 1.0, Handling 3.0, Ergonomics 1.7, Pollutants 1.0).
- Seat weight: 4.5kg (shell only, per Cybex).
- Dimensions: approx. 645-750mm (L) x 440mm (W) x 380-600mm (H) depending on recline position, per Cybex.
- Base: Base T (ISOFIX, sold separately, €239.95) or Base Z2; the Base T is also compatible with the Sirona T i-Size and Sirona Z2 i-Size. Installation with the vehicle’s three-point belt and no base is also possible.
- Materials: molded plastic shell (exact polymer not published by Cybex) with a breathable knit/mesh fabric cover.
- Care: cover is machine washable but not quick to remove and refit; shell wipes clean.
- Awards: Good Design Award 2024; ÖAMTC-listed; AGR (“Aktion Gesunder Rücken”) ergonomic seal.
- Warranty: Cybex does not publish a seat-specific warranty period on its German site; the standard EU statutory guarantee, typically two years from the retailer, applies.
- Price: €269.95 for the seat (Platinum line); €239.95 for Base T; other colourways currently run from €239.95 to roughly €289 depending on trim, per German retail listings.
Pros & Cons
What earns its keep:
- Genuine near-flat recline, in the car and on a compatible stroller.
- Joint ADAC/Stiftung Warentest test winner (October 2023), with strong safety sub-scores both with and without the base.
- L.S.P. side-impact system and a twelve-position headrest that keeps pace with a changing head shape.
- Base T’s rotating, indicator-confirmed ISOFIX installation takes a lot of the guesswork out of fitting it correctly.
What to weigh before buying:
- No aircraft certification that we could find, unlike Cybex’s own Cloud G i-Size.
- Base T is a separate purchase at €239.95, so the honest total for the system most families end up with is closer to €500 than the €269.95 headline price.
- The cover is machine washable but genuinely fiddly to remove for a wash.
- At 4.5kg, carrying it fully loaded gets tiring on a long transfer day.
- A child with an early growth spurt may outgrow the shell by height well before the marketed 24 months.
FFH Gear Score
Functionality: 9.0 / 10.
Build Quality & Durability: 8.6 / 10.
Ease of Use: 8.3 / 10.
Family Practicality: 8.5 / 10.
Pricing: $$$$ of $$$$$.
FFH Gear Score: 8.6 / 10.
Final Verdict
The Cloud T i-Size is not the cheapest seat in its class, and once the Base T is added it is not a cheap system at all. What the money buys is a shell that two of Germany’s most rigorous test bodies rated the best on the market in their most recent comparison, a recline that genuinely helps a small passenger sleep properly instead of just tolerating the drive, and a rotating base that makes the daily business of loading and unloading a newborn noticeably less of a wrestling match. Skip it if an aircraft-approved seat is a hard requirement, or if the honest all-in budget realistically stops closer to €150. For everyone else assembling a first proper travel kit around a new baby, this is one of the few purchases in this category where the premium price and the premium result actually line up.
One practical note on where to buy it: at the time of writing we could not confirm a clean, seat-only listing for the Cloud T i-Size on amazon.de under its own ASIN (searches keep surfacing Cybex’s Cloud G and Sirona lines instead). The official Cybex store, and specialist retailers such as the ones listed on Geizhals, are the more reliable route to the exact Platinum-line seat reviewed here until that changes.
Gallery
Cybex Cloud T i-Size: Frequently Asked Questions
Who is the Cybex Cloud T i-Size best suited for?
Families with a newborn to roughly 18-month-old who do a lot of car travel and want the calmest possible ride for a small baby. The near-flat recline and the Base T's rotating ISOFIX installation make it strongest for frequent airport-to-hotel transfers and everyday driving with an infant who is not yet sitting independently. It is not the right choice if you specifically need a seat with published aircraft certification, or if your budget realistically stops well under €400 for seat and base together.
What age, weight and height range does the Cloud T i-Size cover?
Birth (from 45cm) to approximately 24 months, up to 87cm and a maximum of 13kg, per Cybex's own specification under UN R129/03 (i-Size). In practice, independent reviewers report that many children outgrow the shell by height noticeably earlier than the marketed 24 months, closer to 15-18 months, so treat that figure as an upper bound rather than a guarantee.
Do I need to buy the Base T separately, and what does it add?
Yes: the Cloud T i-Size shell and the Base T are sold as two separate products, priced at €269.95 and €239.95 respectively on Cybex's own German store. Without the base, the seat still installs correctly using the vehicle's three-point seatbelt (tested by ADAC/Stiftung Warentest at 2.1 overall). With the Base T fitted, installation is ISOFIX-based with a load leg and a rotating mechanism that turns the shell toward the car door for loading, and the same joint test scored that combination at 1.7 overall. The base also adds compatibility with the Sirona T i-Size and Sirona Z2 i-Size seats as a child grows.
Can I use the Cloud T i-Size as a car seat on the plane, and how does it handle at the airport?
We could not find a published aircraft-certification manual for the Cloud T i-Size, unlike Cybex's own Cloud G i-Size, which ships with one. An independent reviewer at Pushchair Expert lists this as a real drawback of the model. Treat it as ground transport only: check it as gate luggage or hold luggage rather than planning to strap it into an airline seat. Through the terminal itself it works well, clicking onto CYBEX and gb strollers with the matching adapter for a one-handed travel system.
How easy is the Cloud T i-Size to install and use day to day?
Straightforward with the Base T, less convenient without it. The base's indicator windows confirm the ISOFIX connectors and load leg are correctly seated before you trust it with a baby, and the rotating mechanism removes most of the awkward reaching that comes with fitting a rear-facing seat. The recline is a genuine one-hand adjustment. The main daily friction is the seat cover, which is machine washable but fiddly to remove and refit, and the shell's 4.5kg weight, which is noticeable when carrying a sleeping baby over any real distance.
What safety certifications and independent test results does the Cloud T i-Size have?
It is approved under UN R129/03 (i-Size) and was the joint test winner of the German ADAC/Stiftung Warentest child-seat test in October 2023, scoring an overall 1.7 with the Base T fitted (Safety 1.3, Handling 2.2, Ergonomics 1.9, Pollutants 1.0) and 2.1 on the vehicle's seatbelt alone (Safety 1.0, Handling 3.0, Ergonomics 1.7, Pollutants 1.0). It also carries an ÖAMTC listing, a Good Design Award (2024), and an AGR ergonomic seal. Cybex's own linear side-impact protection (L.S.P.) is stated by the manufacturer to cut side-impact forces by up to 25 percent; that specific figure is a manufacturer claim rather than an ADAC-measured one.
What are the main real-world drawbacks of the Cloud T i-Size?
Cost, weight and the cover. The seat and Base T are sold separately, so the honest total for the system most families end up buying is closer to €500 than the €269.95 headline seat price. At 4.5kg the shell is not heavy for its category but is noticeable on a long carrying day. The cover is machine washable but genuinely fiddly to remove and refit for cleaning. It also lacks the published aircraft certification that Cybex offers on its Cloud G i-Size.
Is the Cloud T i-Size worth the price compared with cheaper i-Size infant seats?
For a family that drives frequently with a young baby, yes. Budget i-Size capsules on the German market start well under €150, but they do not carry the same joint ADAC/Stiftung Warentest test-winner result or the same near-flat recline. If your use case is mostly occasional, short car journeys, a simpler and cheaper seat may serve you just as well. If you are assembling a first travel kit around frequent transfers and long car journeys with a newborn, the safety data and the recline comfort make the premium price easier to justify.
How does the Cybex Cloud T i-Size compare with the Doona Liki Trike S5 or the Nanit Pro Camera for family travel?
They cover different stages and different jobs, so it is less a straight contest than a sequence. The Doona Liki Trike S5 is a fold-flat toddler trike for a child who is already sitting up and mobile, not an infant capsule, so it takes over once the Cloud T i-Size's roughly 15-24-month window closes. The Nanit Pro Camera solves a completely different problem: it is a mains-powered, Wi-Fi-dependent monitor for watching a baby sleep in a fixed location, useful in a long-stay rental but not something you carry through a terminal. Of the three, the Cloud T i-Size is the one piece of kit actually doing the work of keeping a newborn safe and asleep between the airport and the hotel room.
