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rainier® 2AX

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Diono Rainier 2ax car seat in black.
Diono Rainier 2ax car seat in grey dark.
Diono Rainier 2ax car seat in grey oyster.
Diono Rainier 2ax car seat in red.
Diono Rainier 2ax car seat in blue.
Diono Rainier 2ax car seat in plum.
Diono Rainier 2ax car seat in yellow sulfur.

ultimate luxury – all star safety

Whatever the weather, wherever you are going, the Diono rainier® 2AX is the car seat you can trust to protect your precious little one. The complete car seat system with extra-deep side walls, providing enhanced side impact protection. The full steel frame, extra-deep aluminum reinforced sides, and energy absorbing foam deliver best in class protection for your little one. And with extended rear-facing capabilities the rainier® 2AX accommodates children weighing 5 – 65 lbs. With a unique low profile design, boarding your child becomes simple and easy. It could be the only car seat you’ll ever need. The Diono rainier® 2AX takes car seats to a whole other level. We’ve thought of everything so you don’t have to.

car seat installation

why parents love me

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The Rainier 2AX is definitely the best car seat we’ve had! We have had several over the years, and none of them compare to this brand!

- all about my bb girls

product specs

product specs

5-50 lbs / 2.3-22.7 kg

20-65 lbs / 9.1-29.5 kg

Seated torso height
8.25-17″ / 21-43.2 cm

Overall maximum height
up to 57″ / 144.8 cm

care & maintenance

Cover machine washable at 86F/30C/Cold

tips and tricks

installation tips

    • read the manual the comes with your car seat

    • read the vehicle manual

    • find a certified child passenger safety instructor or technician to help you and check your installations
  • airline use

    • unfold the Diono car seat before boarding the plane and ask the flight attendant for seatbelt extenders

    • make sure to install the car seat next to the window so passengers can get by in case of an emergency

    • make sure to take the slack out of the seatbelt extender before connecting to the airplane seatbelt
  • rear-facing installation

    • first secure the detachable base and slide in the locking mechanism

    • adjust the harness to be the proper height for rear facing

    • adjust the head support to fit your child properly
  • folding & unfolding

    • to unfold: lay the car seat down on a stable flat surface and undo the velcro strap, tuck it in behind the fabric and open seat until clicked and locked.

    • to fold: remove the red velcro strap from behind the fabric and loosen up the harness as much as possible so they are at the top of the car seat. release the lever at the bottom of the car seat and push seat inward - secure the top with the red velcro strap.
  • right for newborn?

    • whether you buy an infant only car seat or an all-in-one convertible car seat, both car seats have to meet the same standard

    • seats like the Diono all-in-one convertible car seats come with an infant cushion insert to properly fit your child in the harness

    • all-in-one convertibles are more economical - they have a lot of room for growth for your growing child
  • baby on board!

    Keep the little ones comfortable and positioned well when on the move, and stay one step ahead with cleverly designed accessories.

    why parents chose me

    All Aboard

    Easy boarding low profile – it’s the little things that make life simpler.

    Stylish and Snug

    Modern, versatile cover in soft, premium fabric for a comfortable ride everyday – it’s absorbent, easy to remove and machine washable too!

    Travel The World

    Super portable, folds flat with available carry straps for easy travel and transporting.

    Easy Installation

    Unique SuperLATCH™ system makes installation quick and easy. A versatile top tether for both rear and forward-facing unique car seats.

    award winning car seats

    exquisite luxury

    inspired by the best European fashions
    buy now

    parents’ choice

    your choice

    colors that speak all languages

    parents love the rainier 2AX!

    “We initially bought a Diono to keep my oldest son rear facing. In the radian, he made it to 3.5. When it came time to buy a convertible for my youngest, I knew I wanted to skip the runaround we had the first time and go with the seat that would last us the longest from the getgo. We got a great deal on the rainier and have been super happy with it. It’s comfortable and installs fairly easily rear facing. My son has been in it since 6 months and seems very comfortable. I expect it to last us until at least 3.5 rear facing, and then a long time forward facing. I feel like he’s super safe in this seat and that’s my favorite part.”

    -Mama Bear, Canton MI

    Our 2-year old finally out-grew her infant car seat and we wanted the option to rear-face longer. Had I known about this seat when she was first born, I would have purchased it then! We love this seat! After using other rear-facing seats (friends & grandparents), I can honestly say you get what you pay for. Those other seats were extremely affordable but I wouldn’t feel safe with my child riding in them. I drive a small car and with the angle adjuster, the seat fits and I have room to adjust both the driver & passenger seats- that wast he only thing I was worried about. I think this seat was well-worth the money!

    -NOLA Mom, New Orleans LA

    “I received this a few weeks ago and man it’s amazing!!! My 13 month old loves it so much! It’s very well designed and super easy to clean!! Highly recommend them if you’re on the look out for an amazing car seat!! It’s very easy to use and put together !:)”

    -dreilyrivera, Nebraska 

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    can I install the rainier® 3-across in my car?

    generally, the car seat will not fit 3-across if all the car seats are all the same width. Because the Rainier 2AX is 18.5″ (47cm), we recommend using the Diono Radian series of car seats as they have a slimmer profile at 17″ (43.2cm) wide.

    can the harness straps be cleaned?

    yes, we recommend using a damp cloth with a solution of water and baking soda to wipe the straps clean. They cannot be saturated in any liquid, or they will need to be replaced. Replacement harness straps can be purchased on our website

    can I use the rainier® 2AX from birth?

    yes, the weight limits on all our convertible car seats starts at 5lbs/2.3kg. The newborn must also meet a length requirement where the top of their shoulders reaches the lowest harness slot on the seat.

    are the harness pads and buckle pads required on my seat?

    yes, required while forward-facing. They are optional but recommended while rear-facing. The center buckle pad is required at all times.

    are the harness pads and buckle pads required on my seat?

    yes, required while forward-facing. They are optional but recommended while rear-facing. The center buckle pad is required at all times.

    can the memory foam be washed?

    yes, it can be hand washed in cold water and air dried.

    what is the difference between the rainier® 2AX and rainier® 2AXT?

    the rainier® 2AXT comes with adjustable head wings and can convert to booster mode, whereas the rainier® 2AX does not.