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Cosco

Cosco Mighty Fit 65 DX Convertible Car Seat, Heather Onyx

  • Based on 2,913 reviews
Condition: New
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Availability: Only 4 left in stock, order soon!
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Arrives Wednesday, Feb 11
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Features

  • With two modes of use, this extra-comfortable LATCH-equipped Cosco Kids car seat accommodates infants from 5 pounds up to toddlers weighing 40 pounds in rear-facing mode and kids up to 65 pounds in forward-facing mode.
  • The five-point harness adjusts easily from the front of the seat and features five heights and three buckle locations.
  • Built-in side-impact protection keeps your little one extra secure. Designed to be just the right size, the seat takes up less space while rear-facing so parents can have more leg room.
  • Three of these seats can fit side-by-side in the back seat of most cars, perfect for growing families.
  • With plush padding and premium fabric, this seat gives your child an extra-comfy ride. Easy to clean, the fabric car seat cover is machine-washable and dryer-safe.
  • This car seat meets or exceeds federal, ASTM, and JPMA safety standards and includes a one-year limited warranty.
  • For more than 70 years, Cosco Kids has been a leading childrens products brand recognized for its dedication to safety and value. From bouncers to car seats, swings to strollers, and high chairs to play yards, Cosco Kids's essential baby products feature solid value and smart design.

Description

Get the car seat that’s designed with your family’s real life in mind. The Cosco Kids™ 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 takes 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 Kids™ in Columbus, Indiana. Made by American families for American families.

Brand: Cosco


Installation Type: Latch


Material: Fabric


Color: Onyx


Orientation: Forward Facing, Rear Facing


Product Dimensions: ‎26.5 x 21.5 x 24 inches


Item model number: ‎CC173EEN


Is Discontinued By Manufacturer: ‎No


Minimum weight recommendation: ‎5 Pounds


Maximum weight recommendation: ‎40 Pounds


Minimum height recommendation: ‎19 Inches


Maximum height recommendation: ‎30.5 Inches


Material Type: ‎Fabric


Number Of Items: ‎1


Style: ‎Car Seat


Number of reclining positions: ‎5


Batteries required: ‎No


Orientation: ‎Forward Facing, Rear Facing


Rear-facing minimum child weight: ‎5 Pounds


Rear-facing maximum child weight: ‎40 Pounds


Forward-facing minimum child weight: ‎22 Pounds


Forward-facing maximum child weight: ‎65 Pounds


Harness type: ‎5-Point


Item Weight: ‎12.76 pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Feb 11

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Works great
Color: Onyx Style: Car Seat
Great value. I bought this seat for when the grandbaby comes over. She is 32 lb. This is a great seat that should last for years. Not bulky. Easy to take in/out. I use the latch system which is easy. Install it only when needed. Once you practice, you can install in under a minute.
Reviewed in the United States on November 22, 2025 by M. Floe
    • Lightweight, easy to install, and spacious—great for travel!
Color: Onyx Style: Car Seat
I purchased this car seat for our little one specifically for travel, and it’s been a fantastic choice. Key Features Lightweight: This car seat is incredibly lightweight, which makes it perfect for travel. It’s easy to haul around without too much effort. Quick Installation: Installing it front-facing is super quick and simple, which is a big win when hopping in and out of Ubers or rental cars. I haven’t tried rear-facing, so I can’t comment on that, but the ease of front-facing installation is a huge plus for us. Spacious: The seat is very roomy, which works well for our ever-growing toddler. It’s comfortable and gives them plenty of space without feeling cramped. Ease of Cleaning The cover is easy to remove, which makes cleaning straightforward. However, since it isn’t water-resistant, you’ll need to plan for drying time if there are accidents and you don’t have access to a dryer. ... show more
Reviewed in the United States on January 13, 2025 by Lizzie
    • Comfy, basic, difficult to install rear-facing
This seat is plush and cool, so my kids are very comfortable in it. The materials are great, the size is perfect, the safety ratings are reassuring, and the price is amazing! This is a bare bones seat, though. It has no convenience features like an easily adjustable no-rethread harness, or a level so you angle is correct. However, that is reflected the VERY affordable price (about $85) The only issue I have with this seat is that it is a huge pain to install it correctly and securely in a rear facing orientation, especially if you have deeply contoured seats. PROS: - Great rear facing height and weight limits - Higher forward facing weight limit than almost any other seat in this price range, allowing your bigger kid to stay in a harness longer. My 4 year old is almost 45 pounds, so this 65 pound forward facing limit will allow him to stay on a harness for a few more years, until he is ready for a belt positioning booster. - Relatively compact size, with straight sides that make it easier to fit next to another seat. - Comfortable, cool fabric. Won't absorb heat like a dark seat if you live somewhere hot. - Plush seat! - Machine washable cover. - Cute styling! I got the aqua blue for both my son and daughter and they love it. - Easy forward facing install. - Lightweight and easy to carry for travel. CONS: - Difficult to get a tight installation rear facing. - Does NOT fit 3 across in a Jetta. - Tedious to rethread the straps and adjust the headrest. - The button you have to push to loosen the straps is buried under the cover and not marked, so it isn't easy to find and use. All in all, this is a great basic seat for the money! I use them as travel seats and back ups in our second car. This seat won't work well for someone who needs to use it for different children, as it must be removed from the vehicle to adjust the headrest and strap heights. It also wouldn't be ideal if you were going to be moving it from one car to another frequently, as the install isn't as quick and easy as it is on models with more convenience features. But it's safe and sturdy and does its job, and you really can't beat it for this price! ... show more
Reviewed in the United States on February 15, 2017 by Brandy T.
    • Simple & great
Color: Onyx Style: Car Seat
Ordered this to go into grandma’s car when my kids are with her. It’s super light weight. But definitely hard to secure into place. Doesn’t look very comfy, and there’s not like head rest. But at the same time, you’re getting what you pay for, so value for money, I think it’s great. It’s pretty small which is great for saving space or in smaller cars. ... show more
Reviewed in the United States on June 29, 2024 by Audrey Rogers
    • Great for the price
Color: Onyx Style: Car Seat
In terms of cost, I think this is a pretty great, basic car seat. There’s no fancy “bells and whistles” included that some other models may have, but it does have a cup holder, and a headrest that is easily adjustable. We’ve had this car seat for about a year now and it’s held up perfectly. Easy to clean, travel with, and secure into your vehicle. We’ve only ever secured it with the seatbelt. Pros: The Onyx color is lovely, we didn’t want anything too bright or flashy and the color in person matches the picture. It seems comfy, I’ve obviously never used it personally, but my daughter has never seemed to have an issue. Lightweight. Pretty compact in size compared to others, we have a very small vehicle (Chevy Spark) and this fits pretty well without looking very bulky. Although, it doesn’t fit in rear facing position without moving the passenger seat as far up as possible. Cons: The straps twist constantly in the bucke part. I don’t know if I’m doing something wrong, but I can’t seem to stop it from happening. ... show more
Reviewed in the United States on August 29, 2017 by Jardana Henson
    • Decent for travel
Color: Onyx Style: Car Seat
Decent for the cost, but definitely a huge pain to install rear facing if necessary. I practiced in my own car before we left for our trip, and still struggled to get it right once we got to our destination. Luckily my child is borderline for the requirements for rear vs forward facing, but still something to consider. You can also feel the belt through the back of the cushion so not sure how comfortable it might be for a longer ride. Overall it did what we needed ... show more
Reviewed in the United States on July 30, 2025 by Amazon Customer
    • Anything that might get puked on can be removed and cleaned!!
Color: Onyx Style: Car Seat
This is a great car seat. I have a narrow back seat and it let me fit 3 across, two of this seat and a rear facing infant seat. It is super easy to install when using the upper anchor and a lap belt, we couldn't use the lower tethers since we needed three across. The best thing of all to my mind is that the liner comes out really simply once the car seat is out of the car, it's also washable, and the strap that goes from the shoulder to the crotch is all one piece that the buckles thread onto so you can remove the whole thing, put the buckles in the dishwasher and the belt and cover in the washer and get it all clean. The buckle that comes up from the crotch doesn't come out but it doesn't have the crevices that the other pieces do so it wipes down easily. If you need a skinny car seat or have a travel sick kid this seat is a must! ... show more
Reviewed in the United States on August 27, 2022 by D.G.

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