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Cosco MightyFit 65 DX Convertible Car Seat - Heather Onyx

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Cosco MightyFit 65 DX Convertible Car Seat - Heather Onyx - Cosco  - Babies"R"Us
Cosco MightyFit 65 DX Convertible Car Seat - Heather Onyx - Cosco  - Babies"R"Us
Cosco MightyFit 65 DX Convertible Car Seat - Heather Onyx - Cosco  - Babies"R"Us
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Product Description

Get the Car Seat that's designed with your family's real life in mind. The Cosco MightyFit™ 65 DX Convertible Car Seat keeps your child safer in the car all the way from 5-65 pounds. It'll keep your baby comfortably rear facing up to 40 pounds, and then transitions to forward-facing mode up to 65 pounds. Not too big and not too small, the MightyFit 65 DX is designed to be the right size. In rear-facing mode, it has been designed to take up less room, which gives parents more leg room in the front seats. The Car Seat will also fit three across the back seat of most vehicles, which is great for growing families. MightyFit 65 DX keeps kids safer with Side Impact Protection built right in, and a 5-point harness that adjusts easily from the front of the seat. The harness features 5 heights and 3 buckle locations so you can be sure you're giving the best fit to your growing child. The MightyFit 65 DX Convertible Car Seat is mighty comfortable for kids and convenient for parents too. Kids will love the plush padding and deluxe materials that give them an extra comfy ride. You'll love that the fabric is both machine washable and dryer safe, making this seat super easy to clean when messes happen. If your chosen vehicle happens to be an airplane, this Convertible Car Seat has got you covered. Certified for use on aircraft, it gives your child a familiar seat during the flight. Its compact design also makes it easier to manage through airport security checks. The MightyFit 65 DX is proudly made by Cosco in Columbus, Indiana. Made by American families for American families.

COSCO Brand Store!


  • An extra-comfortable ride that lasts for years: Rear-facing 5-40 pounds and Forward-facing 22-65 pounds
  • Fits 3 across in the back seat of most vehicles; Gives parent in the front seat more leg room
  • Side Impact Protection; 5-point harness with easy up-front adjustment
  • Deluxe fabrics are machine washable and dryer safe; LATCH equipped
  • Airplane ready; Exceeds Federal Safety Standards

Additional Info





5 lbs

65 lbs


5 Point Harness,Adjustable Head Support,Cup Holder(s),Front Adjusters,Latch,Washable Fabric

Not Rated

14 pounds

30.5 x 18.5 x 14.0

How to Get It

  • This item can be shipped to all 50 United States including Alaska & Hawaii
  • This item is NOT eligible for shipping to APO/FPO addresses, U.S. Territories, Puerto Rico or P.O. Boxes
  • Due to shipping restrictions, Ship Charges will be separate from other items in your order
  • This item may ship by itself

  • This item ships via Standard Shipping only

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  • This item is sold online only (not sold in stores)
  • Orders placed for Store Pickup will receive online pricing and promotions
  • In-stock status is approximate and may not reflect recent sales
  • Not all items are carried at all stores. Please click the "Select a store" link to check product availability

Average Customer Rating:

by PowerReviews
Cosco IncCosco MightyFit 65 DX Convertible Car Seat - Heather Onyx

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 1 Stars



Reviewed by 1 customer

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Nice seat for an affordable price

By STL Nana

from St. Louis, MO

About Me Grandparent

Verified Buyer


  • Easy to install


  • Difficult To Adjust

Best Uses

  • Toddlers

Comments about Cosco Inc Cosco MightyFit 65 DX Convertible Car Seat - Heather Onyx:

Doesn't seem as substantial as other seats we've had, but they all have to pass specific safety standards so I'm sure it's good. We liked that it takes up less room than most, since we have a small car.

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Size Chart