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what is the difference between the J130 and J140 jackets

Is this Jacket good for outdoor construction work?

I am 5"7 and 150lb. Would i be a medium or a large if u were to want to wear a small hoodie inside of this as well or just so its not tight fitting?

After reading the reviews, I am really confused as to which size I need to order. My pant size is 32/33 (U.S). Any suggestions?