I am a slightly small guy - 5'8, 150, medium to slight build and am not sure whether a small or medium would be more appropriate. A big concern for me is how the neck will fit - I am at the 14 1/2 inch range putting me at the cusp of small and medium and I know virtually no shirt or jacket I buy fits my neck, ever. If I'm thinking of spending over $300 I'd rather not need a scarf to prevent draft. any hints on the fit?

Tech Specs:

Material:

[shell] DWR-coated Gridlock P-120; [lining] Halo P-180 WR 

Insulation:

800-fill down 

Fabric Waterproof Rating:

water-resistant 

Venting:

none 

Pockets:

2 hand, 1 interior 

Hood:

yes 

Weight:

1 lb 15 oz 

Recommended Use:

alpine climbing, winter camping 

Manufacturer Warranty:

lifetime