I'm sold on this, but I'm worried about the sizing. I'm 6'4", usually wear a large (42" chest) but arm length is an issue. Montbell lists the arm length on their L products at 35", which would be pretty short for me. Usually I'm swimming in an XL, but it sounds like some people think this product runs small--do you think the XL would be the right size to try?

Tech Specs:

Material:

15D Ballistic Airlight ripstop nylon 

Insulation:

800-Fill down 

Hood:

Yes 

Pockets:

2 Front 

Waterproof:

Water-resistant 

Core Venting:

No 

Weight:

[Size M] 7.4oz (230g) 

Recommended Use:

Compact winter insulation, backcountry layering, fastpacking 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China