can i use this as a ski jacket or do i need to wear a jacket under it to keep me warm?

Tech Specs:

Material:

2L HyVent 

Insulation:

None 

Core Venting:

Core zip vents 

Pockets:

[External] 2 hand, 1 arm; [Internal] 1 MP3, 1 goggle 

Seam Taped:

Yes, fully 

Powder Skirt:

Yes 

Hood:

Yes 

Zip-in Compatibility:

No 

Recommended Use:

Skiing, snowboarding 

Manufacturer Warranty:

Lifetime