for children 5-65 lbs.

Stratos ADVANCED Convertible Car Seat (Jet)


The Stratos ADVANCE features Sensorsafe technology for advanced safety. SensorSafe Technology works by alerting a caregiver that a child is present in the vehicle upon reaching their destination or if the chest clip becomes unbuckled during the trip.


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Item No. 38311770

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Additional Information


To encourage safety, the Stratos™ is weight-rated for up to 40lbs rear-facing and up to 65lbs forward-facing so your child can remain harnessed longer. This seat also includes a 5 position adjustable headrest and 6 shoulder harness strap heights to provide a true extended fit option. For added comfort, we’ve built-in a ventilation system that enables a steady airflow for your child through all seasons. To make installation quick and easy, we’ve added our SureSafe™ Installation which is comprised of Quick Connector® technology and LATCH Guides, increasing proper installation by 2X compared to installation with standard LATCH hooks. To further promote safety, each Stratos™ Convertible Car Seat is structurally tested for safety in the event of a rollover accident for built-in safety from every angle!

Child Specs (5-65lbs)


  • Weight: 5-40 (2.3-18.0 kg)
  • Height: 19-40 inches (48-102 cm)
  • Fit: The top of the child's head must be at least 1 inch below the top of the child restraint seat back.


  • Weight: 22 – 65 (10 – 29.4 kg)
  • Height: 28 – 54 in. (71 – 137 cm)
  • Age: At least two years of age.
  • Fit: The top of the child’s ears are at or below the top of child restraint seat back. At least one year of age

Product & Shipping Specs

  • Dimensions: 26” H x 18.5” W x 15.5” D
  • Product Weight: 13 lbs. (5.67 kg)
  • Package Width: 19.125
  • Package Weight: 14.9
  • Package Depth: 19.125
  • Package Height: 29.625

Safety Testing

At Evenflo, we continue to go above and beyond government standards to provide car seats that are 2X the Federal Crash Test Standard.

  • Rollover Tested: Evenflo is leading the industry with the development of a dynamic rollover test.
  • Side Impact Tested: Meets or exceeds all applicable federal safety standards and Evenflo’s side impact standards.
  • Designed and tested for structural integrity at energy levels approximately 2X the federal crash test standard.
  • FMVSS 213: Federal Motor Vehicle Safety Standards for Child Restraint Systems
  • FMVSS 302: Federal Motor Vehicle Safety Standards for Flammability of Interior Materials
  • Certified For Use In Aircraft: When used with the internal 5-point harness this restraint meets FAA Inversion requirements for airplane use.

Use & Care

Read all instructions and warnings on the product, product labels, and instruction manuals before use. Consult your vehicle owner’s manual to determine proper placement of child restraint in your vehicle and familiarize yourself with your vehicle’s components.

Browse Instruction Manuals »

Cleaning Instructions
  • DO NOT lubricate or immerse in water any part of this child restraint, unless rinsing is permitted
  • Plastic and metal parts may be wiped clean with mild soap and water and dried with a soft cloth. Do not use abrasive cleaners or solvents.
  • Take care not to damage any labels.
  • The harness can be wiped clean with mild soap and water. Allow harness to air dry.
  • Machine wash the seat pad separately in cold water, delicate cycle. Tumble dry 10 to 15 minutes on low heat.
  • Periodically inspect and clean the restraint's crotch buckle of food, liquids, and other debris to ensure proper latching. Place the buckle in a cup of warm water and gently agitate the buckle back and forth. Press the red button several times while the buckle is in the water. Do not submerge the harness strap. To avoid damage to the buckle, do not clean the buckle with soap or detergents and do not use a lubricant.
Stratos ADVANCED Convertible Car Seat (Jet) is rated 4.2 out of 5 by 21.
Rated 3 out of 5 by from It’s a good car seat besides 2 things. I lreally like the color and the design of the car seat for the pad. I also like how the cup holders come out. It makes it easier to clean with kiddos. It is very sturdy. I don’t like how easy it is to access the loosen buckel for the straps that my toddler can reach. Plus it is really hard for me to pull the straps tight. I also like how it is till over tested. My daughter thought it was very comfortable. This would definitely be my backup car seat, but not something that I would use every day just because my daughter can reach the loosen buckel.
Date published: 2018-02-16
Rated 5 out of 5 by from Super safe and stylish convertible carseat This convertible carseat is not only comfortable but stylish. Most importantly, it is safe. The latches are easy to use, the adjustments are easy to make, and the adjustable head rest is awesome and will go up with her as she continues to grow taller. The initial installment of placing this in my vehicle was very easy. The instructions that come with the convertible carseat by evenflow made installing the seat rather easy as well. Maddison and I like her new Stratos convertible carseat by evenflow. She is all smiles in her new carseat.
Date published: 2018-02-17
Rated 5 out of 5 by from Awesome Car Seat! I could tell the difference between this seat and previous ones my kids (I have 5)have used in the past, as soon as I opened the box - even compared to the most resent ones we've owned! It feels so much more comfortable, as well as sturdy and protective. My 3 year old absolutely loves her new Stratos and now I am actually considering buying a second one for my 6 month old. I can honestly say that I have more peace of mind with this seat and feel like she is much more comfortable when we travel. It's safe to say that she's not the only one who loves this car seat! Oh and the Quick Connector is awesome too! So easy to use!
Date published: 2017-10-11
Rated 5 out of 5 by from Spaceful and comfortable! My daughter was so excited to see she got a new car seat and gave this a thumbs up as soon as she was able to get into it! I am very pleased by how spaceful and easy this was to install. The material is very soft and comfortable. Love that it has rear-facing and foward-facing. I have been a loyal Evenflo customer ever since I became a mom and I couldnt be happier with them for providing such safe and amazing products to their customers. I have never had a problem with any of my products. I will continue to purchase with them as they strive to provide safe and comfortable products for their customers!!!
Date published: 2017-10-10
Rated 5 out of 5 by from Features not labeled in product description Child: 18mo Girl, 30", 22lbs. Car: 2008 Prius (Installed as rear facing) Features not labeled in product description but are good to know: Seat Depth/Width: See Pictures Buckle Storage: (See Picture) Feature used to keep buckle/straps away/open when placing child in seat. I like this feature! Not a Base/Carrier type of car seat. (My previous carrier/seat could separate from base fairly easily. More suitable for an infant.) Now I just say get out and walk yourself! Rear-Facing vs Front-Facing: The seat comes with this swinging portion attached to the bottom of the seat that is very easy to switch for rear-facing or front-facing. It is not a separate piece that needs to be removed and stored it is used for both situations. (You won't be like... "Where did I put that one piece I needed to make it front-facing?") Cup holder: (See Picture) Grey portion is removable. Great for cleaning.(Issue: not sure why they put holes in this insert, any liquid spills inside the insert just come out the holes and right on to the seat/leg area.) Headrest: (See Pictures)Adjusts upward for when your child grows. Exposes more strap adjustments for taller kids and seems pretty substantial(in terms of safety)! (Issue: Headrest(black portion in my picture) and Backrest(grey portion) are not on same plane(headrest is slightly raised) causing my child's head to push just a bit forward. It mostly affects when she starts falling asleep and starts to slouch a bit. It makes it almost impossible for her to fall asleep without her chin resting on her chest. Maybe a small cushion on her back would help this issue, but not sure if that affects the safety/operation of the seat.) The issue is not a deal breaker as I feel the cushion and the build of the headrest is most important for safety reasons. My issue rest more on comfort which is secondary to her safety. So far this has been a great car seat for the short time we have had it and I would recommend it.
Date published: 2017-10-05
Rated 4 out of 5 by from Easy to use! This car seat is for my son's small car and my grandson. It worked great! I did notice the cover is very hard to remove to adjust the crotch strap, but on the upside, I believe it will stay in place over the life of the car seat where others in the past that we have used have become lose and unattached. I like the removable cup holders for the washable feature but they come out very easily, so we are putting those up until baby is old enough to need a cup in the car. Over all, this is a great car seat. Easy to use, and I know we will get a lot of use out of it, because of the high weight limit.
Date published: 2017-10-07
Rated 2 out of 5 by from Nice sleek design... The car seat has a nice sleek design. It's nice and padded for babies to sit in. Sadly I am not a fan of how it installs in my van and one shoulder strap is a bit longer than the other one. Both of these items make me concerned about my little guy's safety. The seat is installed using the car seatbelt but the car seat can still easily be moved up and down, and side to side. Whenever I tighten the 5 point harness, I am unable able to get both sides to be equally tight. Overall I like the design and the cup holders, but not satisfied with a few of the key safety features.
Date published: 2017-10-12
Rated 4 out of 5 by from Easy to install and very sturdy/safe! When I received the Stratos Convertible Car seat, I immediately noticed how sturdy and safe it felt, which as a first time parent, is a top priority. Installation was very easy and the instructions were simple and clear. Once we put our son in to try it out, he seemed perfectly happy and comfortable. We have been using the car seat for a few weeks and our son seems to like his "big boy" car seat. We are glad it can accomodate his growing size and expand with him, thanks to the adjustable head rest. I will say, the head rest seems like it may push his head forward slightly once he is tall enough to use it, but it could only appear that way now because he is too small to use the adjustable headrest. Overall, this has been a great car seat!
Date published: 2017-11-07
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