I am confused by the size 1. I have a 3 yr old daughter that is just into a 3t - she is very tiny. I am thinking of getting a 4T. Is the 1 available more like a 12mos?

Tech Specs:

Material:

Snow Ice Micro fabric with Sparkle Velvet trim 

Insulation:

[Body] 240g Permaloft; [sleeves] 200g Permaloft; [hood] 60g Needlepunch 

Waterproof Rating:

8K 

Breathable Rating:

8000g 

Core Venting:

No 

Pockets:

2 Tricot-lined hand-warmer, internal stow 

Seam Taped:

No 

Powder Skirt:

No 

Hood:

Yes, removable 

Zip-in Compatibility:

No 

Recommended Use:

Skiing, sledding, playing in the snow, cold weather wear 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China