Keep your little one cushioned, supported, and protected on every single journey. The CYBEX Sirona Si Comfort i-Size Car Seat seamlessly combines premium ergonomic padding with everyday parental convenience. Designed with a deep, plush comfort inlay, this version is meticulously crafted to ensure a smooth, gentle ride for baby from toddlerhood up to approximately 4.5 years of age.

The defining benefit of the Sirona Si Comfort is its complete, all-in-one convenience. It includes the rotating Base S directly in the box, giving you a premium, ready-to-use foundation right from the start.

Engineered natively for extended rear-facing travel, its padded, energy-absorbing shell works dynamically with rear-facing physics to deliver up to 50% better protection during a frontal impact compared to standard forward-facing seats.

Key Comfort & Everyday Convenience Features

Rotating Base S Included: Ships with its own integrated base platform, featuring a smart, one-handed 180° rotation mechanism that spins the seat directly toward the car door for stress-free boarding.
Plush Comfort Inlay: Tailored with an ultra-soft, deeply padded fabric lining that cradles your child, cushions them against road vibrations, and ensures proper structural alignment.
Magnetic Harness Holders: Built-in magnets secure the buckle tongues to the sides of the seat frame, keeping the internal straps wide open so you can seat or lift your child without sitting them on loose belts.
All-Round Air Ventilation: Integrated ventilation pathways run through the inner hard parts and textiles, maintaining a breathable, cool climate across all seasons.

Essential Safety Engineering

Extended Rear-Facing Biomechanics: Promotes a safer rear-facing stance from 61 cm to 105 cm (approx. 3 months to 4.5 years). Forward-facing option can also be engaged once your child reaches 76 cm.
Linear Side-Impact Protection (L.S.P.): Features a rigid side-impact safety wing that works in tandem with the energy-absorbing shell to absorb and deflect side collision forces by up to 25%.
Simultaneous Headrest & Harness Adjustment: The headrest and harness move together in harmony across multiple height settings, adapting seamlessly to your child's growth spurts without manual re-threading.
Multi-Position Recline: Easily adjusts through several tilt angles in both rearward and forward-facing directions to keep nap times peaceful and sightseeing comfortable.