ColumbiaMen's Bugaboo IV Pant

Says bugaboo iv, until i put in cart then says bugaboo ii? which are they? difference?

I am 5'10", 184 pounds. I wear 33-34 waist jeans. What size pants do I order for skiing?

How long is large short

I'm 5"10 150. 32 waist (actual measurement) + 31 inseam, What size will fit?