SKU: 95409154974
eternis m4 cybex

eternis m4 cybex CYBEX Eternis S SensorSafe All-in-One Convertible Car Seat

Sale price$19.31 Regular price$21.46
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Ships within 48 hours · Estimated delivery Oct 18 - Oct 23

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Description

eternis m4 cybex CYBEX Eternis S SensorSafe All-in-One Convertible Car SeatThe CYBEX Eternis S with SensorSafe is the only car seat your child will need from their first ride home through every carpool adventure. With its three adaptable modesrear facing, forward facing, and boosterthe Eternis S is designed to protect children from birth up to 120 lbs. Built with CYBEXs signature safety features and thoughtful design, it ensures unparalleled comfort and security for your little one at every stage. From its advanced Linear

The CYBEX Eternis S with SensorSafe is the only car seat your child will need from their first ride home through every carpool adventure. With its three adaptable modes—rear-facing, forward-facing, and booster—the Eternis S is designed to protect children from birth up to 120 lbs. Built with CYBEX’s signature safety features and thoughtful design, it ensures unparalleled comfort and security for your little one at every stage. From its advanced Linear Side-impact Protection (L.S.P.) to the intuitive SensorSafe™ technology that monitors your child’s well-being, this car seat provides peace of mind wherever the road takes you.

What Is SensorSafe? Keeping Your Child’s Safety Front and Center

Equipped with SensorSafe™ technology, the CYBEX Eternis S delivers real-time safety alerts directly to your phone via the SensorSafe app. This innovative chest clip tracks critical safety indicators, such as unbuckling, temperature, and even periods of inactivity, helping you ensure your child’s safety without taking your eyes off the road.

Cybex Eternis S SensorSafe All-In-One Convertible Car Seat Features

3-in-1 Versatility: Switch between rear-facing (4-50 lbs.), forward-facing (22-65 lbs.), and booster (40-120 lbs.) modes to accommodate your child’s growth.
SensorSafe Technology: Safety alerts for peace of mind, including temperature and child unbuckling notifications.
Linear Side-Impact Protection (L.S.P.): Absorbs up to 25% more impact forces in a near side-impact crash.
12-Position Height-Adjustable Headrest: Grows with your child, making adjustments easy with no need to rethread the harness.
Internationally Patented 3-Position Reclining Headrest: Keeps your child’s head in a safe, comfortable position, reducing the risk of forward head slump.
In-Seat Recline and 6-Position Seat Recline: Designed for ergonomic support and extra legroom in the rear-facing position.
Magnetic Buckle Holders: Allows for easy seat entry and exit without searching for the buckle.

Cybex Eternis S SensorSafe All-in-One Convertible Car Seat Weight and Height Limits: How Long Can You Use Cybex Eternis?

Designed to grow with your child, the Eternis S supports rear-facing up to 50 lbs. or until your child reaches 48 inches, forward-facing up to 65 lbs., and then transitions to a high-back booster for children up to 120 lbs. This extended lifespan means your child can enjoy the safety and comfort of the Eternis S for up to 10 years.

Is CYBEX Eternis FAA Approved?

Yes, the CYBEX Eternis S is FAA-approved for air travel, ensuring your child’s safety in-flight. The FAA recommends securing children in an approved child restraint during flights for additional safety during unexpected turbulence. As always, please confirm with your airline before departure and refer to the car seat’s manual for aircraft installation instructions.

Cybex Eternis S SensorSafe All-In-One Convertible Car Seat Manual and Instructions for Installation

Installing the Eternis S is straightforward with CYBEX’s clear, detailed instructions, and it offers LATCH compatibility for secure installation. For a perfect fit and peace of mind, refer to the user manual for guidance on latch, tether, harness, and recline limitations for each mode.

Cybex Eternis S SensorSafe All-in-One Convertible Car Seat Reviews: Why Parents Love It

The CYBEX Eternis S with SensorSafe has received high praise from parents and caregivers who appreciate its seamless blend of safety, comfort, and durability. Many users highlight the SensorSafe technology, noting that it provides an added layer of security, especially for longer drives or busy days. Parents also love the versatile design, allowing them to use one seat for all stages of their child’s growth—from birth up to 10 years. The seat’s sturdy steel-reinforced frame and the unique L.S.P. system are often mentioned in reviews as standout safety features that make parents feel confident in their choice.

Another common highlight is the ease of use. Parents appreciate the adjustable headrest, easy recline options, and magnetic buckle holders, which simplify getting children in and out. Overall, the Eternis S offers long-term value and trusted safety, making it an exceptional investment in your child’s travel safety.

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Shipping Notes
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Exchange/Return Notes
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SKU: 95409154974

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4.4 ★★★★★
Based on 28 reviews
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Mark C.
Birmingham, US
★★★★★ 5
Comfy, thick, bottoms slick enough to wipe clean easily
Color: Long Black, Size: 10-13
Comfy, thick, bottoms easy to wipe clean . Would buy again. A little hot if anything.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 17, 2025
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Timmer
Phoenix, US
★★★★★ 5
Perfect to where around the house
Color: Long Navy, Size: 7-9.5
They worked perfectly. They fit very well.
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Reviewed in the United States on October 26, 2025
A
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avalancheryder
Battle Creek, US
★★★★★ 5
Absolute game changer for chronically dry feet/cracked heels
Size: S (up to size 7)-Beige
I had recently bought a pair of silicone heel/ankle wraps to fill out my boot a little since I noticed my heels were lifting when I was skating. I tested them out around the house and noticed they left my heels softer while the rest of my sockless feet got quite dry. So I got these full foot silicone socks to see the effect of having my whole foot covered. I slather the entirety of my feet with Dr. Scholl's Severe Cracked Heel Restoring Balm (love how convenient it is to apply it to my feet with the solid stick form) and then slip them into these silicone socks. After just a couple hours, when I pull out my feet they're (a teeny bit sweaty at first), but then overall soft and smooth and have absorbed the balm fully leaving barely any residue in the silicone sock. I find these silicone socks generally comfortable; I wear them in the evenings while relaxing on the couch, take them off after a couple hours and let my feet breathe a bit, and then reapply my balm and socks and wear them to bed. If I wake up in the middle of the night, which I almost always do (not because of the socks), I'll take the socks off and allow my feet to breathe again. I wear a woman's size 6 shoe and the small size is pretty comfortable. However, I made the mistake of wearing them while being on my feet for a couple hours straight during household chores -- they must've somehow cut off my circulation a bit with the standing, so I wouldn't recommend wearing these silicone socks while being active. And since they're not exactly my foot size, they slide around sometimes and will start to feel tight at my big toe. But if that happens, I just tug on the toe area of the sock to give my big toe more wiggle room and problem solved. Prior to wearing these socks, I was soaking and doing heavy duty exfoliation of my feet every week. These socks seem like they'll work to help me extend the time between soakings and exfoliations. The 5 pack is a great value. So far none have torn, so they seem rather durable. Not sure what I could even do to tear a hole in these.
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Reviewed in the United States on January 16, 2026
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Beverly Durham
Pawtucket, US
★★★★★ 5
Works wonders
Size: M (up to size 9)-Beige
Works wonders for dry feet, like really dry, hard feet.
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Reviewed in the United States on February 23, 2026
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Therapy by the Sea
Pawtucket, US
★★★★★ 4
EXCELLENT FEET MOISTURE PROTECTION
Size: S (up to size 7)-Beige, Size: S (up to size 7)-Beige
Why did you pick this product vs others?: I have burns on my feet and needed something that I could put burn creme on and still walk around in with. I tried other silicone footsie but they would teae really easily. So far these are doing really well for this purpose. They are holding their shape too. The only caution I have is the same with all silicone footsies: They can be slippery on wet floors, so also wear with socks over them. The biggest issues is when they say a size they mean it. The silicone used in these have little give in them, so they won't stretch out and loose their shape. That can be a good thing, or not so good, depending on how well they fit your feet and what your intent is with wearing these. The other issue is if they fit snug around those toes, that tends to be where the first tear in the material will happen. Because of how these are made, the tear is actually more like cracking in the material and once it occurs you won't be able to get much use out of the sock after that. If you are planning to wear them around the house or for long term use, I suggest going up a size or look for the toeless options.
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Reviewed in the United States on July 5, 2025

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