How to Fit the Cybex Cloud T with Base T i-Size Correctly

Quick answer

Fit the Base T i-Size to your car's ISOFIX points first, push it back until both indicators show green, then lower the Cloud T onto the base until it clicks and the seat indicator confirms it is locked. Before every drive, check the support leg or load leg contact and the base indicators, then adjust the recline so your baby's head is supported. If any indicator is not green, the seat is not correctly installed.

Before you start: what the Base T i-Size needs from your car

The Cloud T i-Size is an infant carrier designed to work with the Base T i-Size, and the base is what anchors the system to the car. This means your car needs ISOFIX anchor points in the rear seats, and you should check the vehicle handbook for approved seating positions. Some cars have ISOFIX in the outer rear seats only, and a few restrict it in the centre or front seat. If your car has no ISOFIX, the base is not the right solution for that vehicle and you would need to look at a belt-routed infant carrier instead.

Clear the rear seat and remove any bulky seat cushions or aftermarket seat protectors that could sit between the base and the vehicle seat. A thin, approved protector is usually fine, but a thick cushion can stop the base from sitting flat and can hide a loose fit. Also check that the ISOFIX bars are visible and free of obstructions; in some cars they are recessed behind zip flaps.

Step 1: Click the base onto the ISOFIX points

Extend the base's ISOFIX connectors, line them up with the anchor bars, and push until each side clicks. Most bases have a release trigger on each connector, and you should hear or feel a positive engagement on both sides. Then push the base firmly back into the seat backrest so the front of the base contacts the vehicle seat. This removes slack and is one of the most commonly skipped steps.

• Common mistake: leaving the base pulled forward away from the backrest, which allows it to rock and reduces protection.
• Checkpoint: both ISOFIX indicators on the base should show green, and the base should not move more than a small amount when you tug it.

Step 2: Deploy the load leg or support leg

The Base T i-Size uses a support leg that extends to the car floor. Pull the leg down until it makes firm contact with the floor, then check the leg's own indicator. The leg should sit flat, not on a storage compartment lid, a footwell mat with a raised edge, or any uneven surface. If your car has underfloor storage, the vehicle handbook will tell you whether that position is approved or whether you need to use a different seat.

• Common mistake: extending the leg onto a plastic trim or a loose mat so it looks deployed but is not load-bearing.
• Checkpoint: the support leg indicator should confirm correct contact, and the leg should not be able to be pushed upward by hand.

Step 3: Lower the Cloud T onto the base

With the base secure, lift the Cloud T i-Size by the carry handle and lower it onto the base, aligning the seat's attachment points with the base receivers. Push down until you hear a clear click. The seat should then be locked and should not lift off when you pull upward on the handle. If your base has a rotation function, keep the seat in the locked travel position until you are ready to rotate it for loading.

• Common mistake: assuming a click means it is fully engaged when only one side has locked; always test both sides.
• Checkpoint: the seat release indicator should show locked, and the seat should not rotate or lift unless you deliberately press the release.

Step 4: Set the recline for your baby

The Cloud T i-Size has an in-car recline feature, and the base and seat together allow you to adjust the angle. For a newborn, use the most reclined position that the seat and base allow so the head and neck are supported and the airway stays open. As your baby grows, you can move to a more upright position, but never so upright that the head flops forward when your child falls asleep. The seat can also be reclined to a full lie-flat position as part of a travel system outside the car, but that is a separate mode and not a substitute for correct in-car recline.

• Common mistake: choosing an upright position because it looks neater, then finding the baby's head drops forward on the first drive.
• Checkpoint: with your baby strapped in, the head should rest back against the seat, not chin-to-chest.

Step 5: Harness and final safety check

Before every journey, check the harness: the shoulder straps should sit at or just below the shoulders for a rear-facing infant, and the harness should be snug enough that you cannot pinch a fold in the strap at shoulder level. Remove bulky coats before tightening, because they create slack in a crash. Then do a final check of the base: ISOFIX indicators green, support leg down and loaded, seat clicked in, and no more than minimal movement at the base when you push and pull it.

• Common mistake: tightening the harness over a puffy jacket, which leaves the straps too loose against the body.
• Checkpoint: the harness should pass the two-finger test at the collarbone, and the chest clip should sit at armpit level.

Fitting steps at a glance

1. Check ISOFIX availability: Confirm your car has ISOFIX in an approved rear seating position and clear any thick seat cushions or protectors. No ISOFIX means the Base T i-Size is not the right fit for that car.
2. Click the base into the ISOFIX points: Push the base back against the seat backrest until both side indicators show green. A base that still rocks or sits forward is not correctly engaged.
3. Deploy the support leg: Extend the leg to firm floor contact, avoiding storage lids and loose mats. The leg indicator must confirm correct contact before you load the seat.
4. Click the Cloud T onto the base: Lower the seat until it locks, then test both sides by pulling upward. One-sided engagement is a common and unsafe mistake.
5. Set the recline and harness: Choose a recline that supports the head and tighten the harness without bulky clothing. Do this before every journey, not just the first installation.

Product facts

• Cybex Cloud T and Cybex Base T i-Size - Black: The Cybex Cloud T i-Size and Base T i-Size package includes a rotation mechanism that lets the seat face sideways for entry and exit, plus a new in-car recline feature for the journey. Outside the car, the seat can be reclined to a full lie-flat position as part of a travel system. The rotation function is only useful if the base is correctly installed first, and the in-car recline should be set per your baby's age and head support rather than left in one position.
• Cybex MIOS Seat Pack - Style Collection, Coconut Brown: The Cybex MIOS Seat Pack is a seat unit that attaches to an existing Mios Frame; the frame is not included. If you are building a travel system around the Cloud T, the Mios Seat Pack is a separate purchase and needs the Mios Frame to work, so plan the whole setup rather than buying the seat pack alone.