sirona eternisTwo amazing convertible car seats are available from Cybex, both with the amazing Sensorsafe technology – the Cybex Eternis S and Sirona M car seats. Safety wise they are both at the top of their game. The little differences between these two strollers are huge and make them function very differently.  How do they line up?

SPECS

The Sirona M has a rear-facing capacity from Rear-facing: 0-40 lbs | Forward-facing: up to 65 lbs. The Eternis S is H 25.5” x W 20” x D 25.3” and 26 lbs. It is meant to be used from rear-facing from 4 lbs. to 50 lbs, forward-facing from 22 lbs. to 65 lbs and can be used as a belt-positioning Booster from 40 lbs. to 120 lbs.

sirona eternis

Safety 

They both have Smart-tech harness chest clip with SensorSafe which provides alerts when unsafe situations arise in the back seat. They also have linear side-impact protection absorbs up to 25% more impact forces in a collision. Both have steel reinforced frame provides strength and durability..Cybex Sirona S Convertible Car Seat with SensorSafe | Strolleria

Installation

Both the Eternis S and the Sirona M have dual-level indicators  to make sure you are installing everything right!  The Sirona M can be installed forward and rear facing. The Eternis S however has a Dual Belt adjusters to ensure a tight fit and an innovative one-pull LATCH removal system with a LATCH Connection storage

 

Cybex Eternis S All-In-One Convertible Car Seat Review | Baby Gizmo

 

ETERNIS S SEAT

The Eternis has a ten position adjustable head rest with a headrest recline. There is a 6-position one-hand adjustable recline for comfort and fit.  The biggest difference between these two is the Eternis booster mode not found in the Sirona. They both have a non rethread five point harness has a harness pads and 2-position padded buckle for extra comfort. 

Cybex™ Eternis S Car Seat | buybuy BABY

Cybex™ Eternis S SensorSafe Car Seat | buybuy BABY

 

SIRONA M SEAT

The Sirons M  has a 12-position height-adjustable headrest with a 10 position adjustable recline. Both car seats have non rethread five point harness and a dishwasher safe cup holder which can be positioned on either side of the car seat for added convenience. The senorsrsafe chest clips on both these strollers  are actually magnetic so it’s easy to keep them out of the way.

 

Cybex Sirona M SensorSafe 2.0 Convertible Car Seat – Lakeland Baby ...

Price 

The Cybex Sirona M retails for $329.95 and we are so excited for parents to fall in love just like we did! The Cybex Eternis S retails for $379.95 and is a great car seat to take you through birth and beyond!

Checkout our comparison chart ⇓

sirona ma
eternis S
Sirona M SensorSafe Eternis S Sensorsafe
Weight 24.7 lbs

26 lbs

Rear-facing Weight Capacity birth-40 lbs birth-50 lbs
Forward-facing Weight Capacity 22-65 lbs 22-120 lbs
Booster Mode x yes
Headrest Recline x yes
Adjustable Headrest yes yes
 Included Cup Holder  

yes

yes
Inseat Recline yes yes
Newborn Inlay yes yes
Recline Positions 10 positions  6 positions
Price $329.95 $379.95