I'm 6' 175 lbs and this is a large. I ended up settling with a XXL.

Tech Specs:

Material:

[shell] eVent 

Fabric Waterproof Rating:

guaranteed waterproof 

Fabric Breathability Rating:

guaranteed breathable 

Fit:

3-D Ergonomic 

Venting:

no 

Powder Skirt:

no 

Pockets:

2 front hand, 1 

Seams:

fully taped 

Hood:

yes 

Weight:

13.6 oz 

Recommended Use:

touring, backpacking, climbing, skiing 

Manufacturer Warranty:

lifetime