More than 10 years of usability – This 2 in 1 seat protects your child with an impact shield until they are 21kgs and then by removing the impact shield and using the vehicle seatbelt until they reach 150cm. UK law dictates that all children must travel in an appropriately sized car seat until they are 135cm tall or 12-years-old, whichever comes first. Lie-flat seats - Research shows that it’s healthiest for newborn babies to lie flat for the majority of the time when they’re sleeping or lying still for periods. The CYBEX Cloud Z i-Size features an ergonomic lie-flat position outside of the car. Patented reclining headrest – The 3 position reclining headrest helps prevent the child’s head from falling forward while asleep. The top ones I'd recommend at the moment are the Cybex Solution S-fix and Z-fix - the difference between these is that the Z-fix expands widthways as well as upwards, whereas the S-fix is just upwards.

CYBEX Solution M-Fix | CYBEX Silver Collection CYBEX Solution M-Fix | CYBEX Silver Collection

The R129 standard, known as i-Size, is the most recent and was introduced to make travel for babies and children safer than the ECE R44 standard. R129 and R44 run side by side, so parents can choose whether to buy and use child car seats that meets either standards. With or without XP-pad - a foam pad which goes across the child's chest and absorbs some forces of a frontal impact. Reclining Headrests – The CYBEX patented reclining headrest prevents the child's head from falling forward while asleep and guarantees optimal protection in the case of a side-impact. The baby or child's height is used to determine if the seat fits the child, rather than their weight. i-Size includes a side impact test to ensure that the seats provide better protection from side impacts.

Often compared with Cybex Solution M-Fix

The Solution S2 i-Fix is built with an energy- absorbing shell which works to absorb the forces of an impact and therefore provides excellent protection to the child. Additionally, the Solution S2 i-Fix contains Linear Side-impact protection system which enhances the safety and protection during a side collision. The linear side impact protection system must be extended on the side closest to the vehicle’s door and this has been proven to reduce the impact of a side collision by approximately 25% compared to seats without the linear side impact protection system in place.

CYBEX Solution X-Fix | CYBEX Silver Collection CYBEX Solution X-Fix | CYBEX Silver Collection

But if your little one has outgrown a Group 1 seat then they will likely be too big for the harness part in the Titan anyway, so it's correct there's not much point bothering with this. If you really did want to harness then you could look at seats which harness up to 25kg, like Joie Bold. You need top tether and isofix in your car to use these seats. Personally for a 5yo unless there are behavioural issues with using a seatbelt, I'd just go for a well rated HBB :) Between version 2 / 3 - the 3 is a bit more up to date and has a longer seat so more support for older children with longer legs. If you choose the XP pad version, the 3 tends to be a bit better at letting the seatbelt retract whereas version 2 has a problem with belt retraction in some cars. The Cybex seats have reclining headrest feature which helps with falling asleep and tend to fit petite kids well, but also go up nice and high to last you until the child is able to use a normal seatbelt. If you fit with isofix you can also recline the whole seat a little bit.