Hi, I'm 5'9" and 160lb. which size will fit me best?

Tech Specs:

Material:

[membrane/laminate] DryRide Durashell 2L, (printed colors) [shell] plain weave, (solid colors) [shell] raised twill 

Insulation:

[body] Thinsulate (60g); [sleeves] Thinsulate (40g) 

Fabric Waterproof Rating:

10,000 mm 

Fabric Breathability Rating:

5000 g/m² 

Hood:

yes, fixed 

Fit:

Sig fit (relaxed) 

Venting:

underarm zip vents 

Powder Skirt:

yes, removable 

Pockets:

(external) 2 hand-warmer, 1 chest zip, (internal) 1 audio, 1 mesh goggle 

Seams:

critical seams taped 

Recommended Use:

snowboarding 

Manufacturer Warranty:

1 year