The coats are all durable water resistant and designed to be perfect for harsh, snowy Northern States and Canada. Parents love them as far north as Alaska and the North Pole. 
 
I do not provide temperature ratings as in general they are a bit of a marketing gimmick - most good companies like Patagonia don't either. 
 
As a one Mama startup I make a promise to parents that's true - this coat is crash tested and designed to be safer than traditional coats and can also be used with the same harness setting as no coat at all without adjustments. I don't want to mix promises that are true with marketing terms that are debatable. 
 
Toasty is our original car seat coat design with a lower neckline than the other coats for little ones who don't like how things feel on their neck.

Toastier and Toastiest provide more coverage for the neck and head against harsh, whipping winds. Toastier and Toastiest also have extendable sleeves for longer wear across seasons.

Toastiest has a fully removable magnetic hood and a thicker warmer sherpa liner as well as Made in US designer flannel in the back.
 
Any choice would work wonderfully at keeping your little love toasty warm and safely dressed for the car seat all at the same time!