Baby, It’s Cold Outside! Winter Coat Suggestions for Kids in Carseats


Updated: January 2021

Michelin-man-style snowsuits might be fine for sledding, but in the car, they can be dangerous. Too much bulk means the harness won’t tighten properly against the child. In a crash, that extra bulk will compress, leaving a too-loose harness, and leaving the child inadequately protected.

So what can you do?

One option is to have your child take her coat off before she gets in the car. Then after she’s buckled, she can slip her arms into the backward coat.

But what if your kids don’t want to take off their jackets? No problem–just look for something car-seat-friendly*.

What constitutes a good coat for the car seat?

Anything that doesn’t add a lot of extra compressible bulk to the child will do. That might be a sweater, fleece jacket, or a packable down jacket.

To see if your child’s outerwear is ok for the car, take the Slack Challenge:

  1. Put the jacket/coat on your child, put him in his seat, and tighten the harness.
  2. WITHOUT LOOSENING THE HARNESS, unbuckle your child and take him out.
  3. Take off the jacket, then put him back in the seat and re-buckle.

If there’s only a little bit of extra slack in the harness (or none at all), the jacket is good! If there’s a significant amount of slack, consider another option.

Winter Coat Infographic

Those two jackets look pretty similar, but you can see how different they really are. In the first photo, my daughter is wearing a Snozu jacket. Without the jacket, the harness had no slack. (In fact, before I took the picture my daughter had been in the seat with no jacket. I didn’t need to loosen the harness at all to buckle her with the jacket on.) The second coat is another story. It’s your typical winter coat, and honestly, it didn’t seem that bulky to me…until I took it off and re-buckled. Wow! There was a lot of slack in that harness!

If you’re looking for a car-seat-friendly winter coat that is safe for the car and warm enough for the playground, here are some good options to try:

My daughter has worn a Snozu jacket, pictured above. This particular jacket squished down into almost nothing, so it was perfect for the car. Costco sells this brand of jackets so if you are a Costco member, check your local stores or order at Amazon has a decent selection of Snozu jackets at the moment. Some of these jackets have a thin layer of fleece inside but still work well in the carseat. These jackets aren’t expensive either, which is a definite bonus! Just keep in mind that jacket styles can change from year to year. You should do the Slack Challenge with each new coat to ensure that it’s not introducing a dangerous amount of slack in your child’s car seat harness.

Parents at rave about the Patagonia Nano Puff and Puff-Ball Jackets.

Many have also said good things about the North Face Moondoggy.

Columbia makes a Powder Lite Puffer jacket that is packable down.

L.L. Bean has PrimaLoft Packaway jackets that are very squishable.

These lightweight ThermoPlume Jackets from Lands’ End also look like they would work well.

Another option is the Buckle Me Baby Coat which we have reviewed. It’s a great alternative to a traditional jacket and allows you to close and zip the jacket over the secured harness. Not only is it warm, but it’s also an extra obstacle for those little Houdinis who like to play with their chest clip!

A Poncho is an affordable, non-traditional option that can work well for some families. We’ve reviewed the Birdy Boutique poncho and found it to be cuddly, warm, and easy to use!

Besides working well in car seats, most of these options will also pack easily in a backpack or diaper bag when you don’t need them. Safe AND convenient!

What great car seat coats have you found?


*Obviously we can only give general guidance and can’t verify every style of every product mentioned here is compatible in every situation.  Checking your owner’s manual and checking your harness system yourself like we describe is the best way to be sure!


  1. Sonja October 27, 2016
  2. Stephanie October 13, 2016
  3. Amy October 12, 2016
  4. Erin September 22, 2016
    • Liz October 23, 2016
  5. Lori December 16, 2015
    • CPS Darren December 16, 2015
  6. Sylvia Newlands October 27, 2015
    • CPS Darren December 14, 2015
  7. Danielle October 4, 2015
  8. Laura Ashleigh October 4, 2015
  9. Christina September 24, 2015
  10. TechnoGranola January 12, 2015
  11. Jill C January 10, 2015
  12. Tina December 15, 2014
    • Christy January 13, 2015
  13. Audrey November 26, 2014
  14. Ben November 24, 2014
    • Katie January 2, 2015
  15. Haley Crook November 20, 2014
  16. Allison Sexton November 17, 2014
  17. Valerie Wall November 16, 2014
    • Vanessa Williams November 17, 2014
  18. Carolyn A. November 15, 2014
  19. Christine November 15, 2014