Diono Rainier 2 aX Convertible+Booster Car Seat

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Ultimate luxury. All-star safety.

Get top-tier safety and streamlined design with the Diono 2 AX Rainier Convertible Car Seat. The full steel frame, extra-deep aluminum reinforced sides, and energy absorbing foam deliver unmatched protection for your little one. The Rainier 2 AX accommodates children weighing 5-120 pounds. It could be the only car seat you’ll ever need.

Heavy is good

Rainier 2 AX convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing EPS foam surrounds your child for ultimate safety. Diono car seats are definitely worth the weight.

Extended rear-facing

The Rainier 2 AX keeps children comfortably rear-facing from 5-50 pounds for the safest possible position. Body support cushions are included to keep newborns and infants comfortable and positioned properly.

Room to grow

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-120 pounds. The aluminum reinforced, adjustable head rest and extra-deep sidewalls provide the ultimate side impact protection.

Exquisite Luxury

Inspired by the best European fashions, the Rainier 2 AX has hand selected soft-suiting fabrics in a contemporary tailored cut and a memory foam seat for a touch of luxury. Lined with thick energy absorbing foam, comfort and safety go hand in hand. A coordinating infant support cushion and a cup holder are included.

Space saving design 

For safety that allows extra room for other passengers, the Rainier 2 AX packs all the safety features into a sleek design, without compromising luxury travel for your baby.

Side Impact Protection

Your child’s safety is covered. Rainier 2 AX seats feature deep, aluminum reinforced sidewalls that extend straight forward and are lined with thick, energy absorbing foam. Diono performed rigorous side impact testing to achieve the proper size, shape and strength that best protects children from side impact forces.

SuperLATCH™ Installation

The unique SuperLATCH™ system makes installation easy and secure. An audible click and visual indicator let you know when the connectors are locked.

Safe Stop® 

The patented Safe Stop® harness component is a load-limiting device that absorbs energy in a crash. The unique design offers an additional layer of protection by reducing impact to a smaller, forward-facing child.

Rear-Facing Tether

As safety experts, Diono thinks of every precaution. Rear-facing tether capability helps reduce seat rotation during an impact. This unique feature is not found on every car seat. It's built it in here for an extra layer of protection when your child is rear-facing.


Key Features

  • NEW! Premium, plush interlock knit fabric with extra padding and support throughout
  • NEW and Improved Car seat fabric cover also covers the rear of the car seat to protect the car interior and ease installation
  • NEW! Labeled pocket on the rear of the seat contains the SuperLATCH system and top tether as well as other accessories
  • NEW and improved reinforced head support
  • NEW tailored infant head and body supports
  • Award wining and best selling
  • Full steel frame for unmatched safety
  • Extra-deep sidewalls lined with energy absorbing EPS foam for superior side impact protection
  • Comfortably seats rear-facing children from 5-50 pounds
  • Forward-facing capacity in a 5-point harness: from 20-65 pounds and up to 57″ in height
  • Converts to a booster for children from 50 pounds up to 120 pounds, and up to 57″ tall 
  • Safe Stop® energy absorbing harness
  • Unique SuperLATCH™ system makes installation easy
  • Sleek design allows extra room for other passengers while providing spacious interior for child
  • Infant body support cushions and memory foam add comfort
  • Expandable sides and long seat bottom offer proper leg support
  • 5 shoulder and 3 buckle positions adjust for a comfortable ride
  • Rear-facing tether capability
  • Angled cup holder keeps drinks upright and within easy reach
  • Folds flat for travel and is FAA certified
  • Rubber bottom grips for no-slip installation
  • Cover is machine washable
  • 10 year life from the date of purchase


  • Usage:
    • Rear-facing car seat: Use from 5-50 pounds, suitable for use from birth with included infant body support cushions
    • Forward-facing with five-point harness: Use from 20-65 pounds
    • Belt-positioning booster: Use from 50-120 pounds, or up to 57” in height
  • Dimensions: 28.25" H x 17.75" W x 15.65" D
  • Weight: 27.55 lbs
  • Capacity: 120 lbs


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