How do ISOFix car seats work?

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ISOFix has been around a long time – over 20 years in fact!  It was developed to tackle the problem of child seats not being correctly fitted.  The idea was to find a method of securing the child seat that removed the use of the adult seat belt – the thing that most people got wrong.

ISOFix works in a similar way to a seatbelt buckle, you need a “male and a female” that you click together to secure. On an ISOFix car seat you will see two extendable metal arms with locks on them- these look like a bit like a birds beak! These locks will fit onto the ISOFix bars located in the car. And because all IOSFix bars and locks are the same distance apart on all seats and in all vehicles, it means that they will always fit and making it virtually impossible to get wrong.

You also tend to have an anti rotation device.  An anti-rotation device helps to prevent the child seat from tipping forward in a crash, and absorbs energy loading. 

One type of anti rotation device is a support leg, which sits against the floor of the vehicle.

Or, the anti rotation device could be a top tether, which attaches to the top tether point in the vehicle.

ISOFix child seats are typically fitted correctly, because they have green indicators to tell you the seat is in place – you know for sure that the child seat is attached to the vehicle.

When ISOFix first launched, it was primarily designed to be used up to 18kg – so it was for children who were using a 5 point harness or infant seat.  This meant the seat belt and its buckle did not have to not be used. As the years went by, ISOFix then got added to high back boosters, and because of the position of the ISOFix point and buckle  in some cars it meant that fastening the seatbelt when it was isofixed in was impossible.  

Don’t panic , sometimes it is possible to move the seat belt buckle to the other side of the ISOFix point (allowing both ISOFix use and the seat belt to be clicked in).  Try not to worry – a non-ISOFix high back booster is just as safe as an ISOFix one, you just need to remember to strap it in when not in use, so it doesn’t become a projectile in a crash.

So, that is how ISOFix works – it attaches your child seat directly to the chassis of your vehicle.

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How do ISOFix car seats work?

ISOFix has been around a long time – over 20 years in fact!  It was developed to tackle the problem of child seats not being correctly fitted.  The idea was to find a method of securing the child seat that removed the use of the adult seat belt – the thing that most people got wrong.

ISOFix works in a similar way to a seatbelt buckle, you need a “male and a female” that you click together to secure. On an ISOFix car seat you will see two extendable metal arms with locks on them- these look like a bit like a birds beak! These locks will fit onto the ISOFix bars located in the car. And because all IOSFix bars and locks are the same distance apart on all seats and in all vehicles, it means that they will always fit and making it virtually impossible to get wrong.

You also tend to have an anti rotation device.  An anti-rotation device helps to prevent the child seat from tipping forward in a crash, and absorbs energy loading. 

One type of anti rotation device is a support leg, which sits against the floor of the vehicle.

Or, the anti rotation device could be a top tether, which attaches to the top tether point in the vehicle.

ISOFix child seats are typically fitted correctly, because they have green indicators to tell you the seat is in place – you know for sure that the child seat is attached to the vehicle.

When ISOFix first launched, it was primarily designed to be used up to 18kg – so it was for children who were using a 5 point harness or infant seat.  This meant the seat belt and its buckle did not have to not be used. As the years went by, ISOFix then got added to high back boosters, and because of the position of the ISOFix point and buckle  in some cars it meant that fastening the seatbelt when it was isofixed in was impossible.  

Don’t panic , sometimes it is possible to move the seat belt buckle to the other side of the ISOFix point (allowing both ISOFix use and the seat belt to be clicked in).  Try not to worry – a non-ISOFix high back booster is just as safe as an ISOFix one, you just need to remember to strap it in when not in use, so it doesn’t become a projectile in a crash.

So, that is how ISOFix works – it attaches your child seat directly to the chassis of your vehicle.

BACK TO BLOG