Hey guys, my sister is thinking about getting this jacket she is 5'8 and thin. what size3 do you think she should get.

Tech Specs:

Material:

[membrane/laminate] Infinidry-8; [shell] nylon oxford; [liner] nylon taffeta, polyester tricot, polyester mesh 

Insulation:

polyfill (80g) 

Fabric Waterproof Rating:

8000 mm 

Fabric Breathability Rating:

5000 g/m� 

Hood:

yes, fixed 

Length:

below hip 

Venting:

underarm mesh 

Powder Skirt:

yes 

Pockets:

2 front hand, (internal) 1 media, (internal) 1 mesh goggle 

Seams:

critical seams taped 

Recommended Use:

snowboarding 

Manufacturer Warranty:

1 year