We don't want a gust of cold wind to harm your toddler that is why we have to find a toddler snow Spyder jacket that is also windproof. The wind also affects the temperature the inside of the jacket so no matter how much insulation the jacket has if it isn't windproof, it not be able to keep your child warm.
Even if the jacket that you're buying is composed of many layers, it still should be breathable because we want your child's skin to still breathe and not accumulate sweat. Sweat accumulation inside the jacket more often than not can lead to sickness.
Additional features that you want to consider are Spyder jackets with hoods. This will provide additional protection to your child's head. Sometimes it is retractable and can be hidden inside the collar.
Others have removable liners which makes the jacket lighter and not too warm when the winter frost is already melting. Make sure also that the jacket is lightweight because you would want your kid to be able to move and play and not feel like hes wearing a ton when he wears his jacket.
Children's opinion as to what design they want on their jackets should also be considered. You can bring them to Spyder outlet when you shop for their jacket. Find one that piqued their interest, one which might have their favorite animal or cartoon character, or one in their favorite color.