Temps drop to as low as -30 on some of the worst Afghani winters. Lows normally hover around 0/-10 to -20 during the average low points. Would this 650 fill be alright with some layering, if I don't plan to hang around outside for extended periods?

Tech Specs:

Material:

[Shell] Pertex; [Lining] polyester 

Insulation:

650+ Fill down 

Hood:

Yes, removable 

Pockets:

2 Hand, 1 chest, 2 internal mesh 

Waterproof:

Yes 

Core Venting:

No 

Weight:

32.9oz (931g) 

Recommended Use:

Alpine climbing, ice climbing, mountaineering 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China