If i was to try on a soft shell, say the Venta AR for example, or any of them really will that size give me good guidance as to which size I should get in a technical shell? We only have soft shells here at the moment so i will have to buy one online somewhere.

Tech Specs:

Material:

489N Gore-Tex Pro Shell 3L 

Fabric Waterproof Rating:

guaranteed waterproof 

Fabric Breathability Rating:

guaranteed breathable 

Fit:

standard 

Center Back Length:

(medium) 30 in 

Venting:

underarm zips 

Powder Skirt:

no 

Pockets:

(external) 2 front, 1 sleeve, (internal) 2 

Seams:

fully taped 

Hood:

yes 

Liner-Compatible:

yes 

Recommended Use:

taking on the most severe weather 

Manufacturer Warranty:

lifetime