The original and still the best since 2006
The Radian® was not only the first All-in-one but also the first car seat to fit 3-across!
As parents we never compromise safety, comfort, style or performance. We spent endless hours designing an all-in-one convertible that would not only meet the demands of busy back seats but was as safe as possible. That’s why we are celebrating this month with a 3rd seat free offer.
*Get your 3rd Radian® 3RX seat FREE when using our special offer coupon code at checkout: 3RDFREE.
Original slim fit 3 across all-in-one convertible
Slim Fit 3 Across
Ultimate passenger comfort with spacious design but only 17” wide to fit 3 across in most midsize vehicles.
10 Years One Car Seat
From rear-facing to forward facing Radian 3RX adapts as your child grows from birth to booster. Suitable from 5 – 120 lb / 2.2 - 54 kg.
Rear-facing for longer
Designed and engineered to keep your child rear-facing for as long as possible up to 50 lb / 22.7 kg.
12 Position Headrest
Creates a safe and comfortable fit for rear facing, forward facing and booster seat modes.
Infant Head Support Liner
Features padded support for added comfort. Simply remove as your infant transitions from rear-facing to forward facing booster seat.
Steel Reinforced Frame
Mechanically engineered, reinforced steel core, made from automotive grade high strength steel to shield and protect.
Radian® 3RXOriginal slim fit 3 across all-in-one convertible
Buy 2 Radian 3RX and get your 3rd FREE worth $269.99Shop Now
Tried, Tested and Loved.
By Kelsey V.
My 2 yr old is so excited about his new blue seat. He says it's comfortable and is now excited to get in it. Great timing as we're about to take a multi state road trip! The seat feels very solid and fits nicely in the back of our Tacoma. Will definitely buy another Diono when we add a second child.
By Jacqueline C.
The Diono Radian3RX is very sleek, strong and easy to use for our toddler. She can get in and out easily and is very comfortable and safely protected. We love it and will be getting another for our 2nd vehicle!
By Margaret H.
It fits 3 across perfectly in my KIA Sorento with room to spare! Everyone is comfortable and safely strapped in. I have never been happier with a seat.