If you guys are talking about the "Movie" Cap look , His boots are of brown leather, If you look there are two types of looks:
1st Look; Some one stated "Jump Boots" Paratrooper boots reproduction set sells for 150.00 (give or take)
2nd look; Almost same type of boots but called "LOW Quarter" style, ca;;ed this for , the use of canvas leggins called "SPATS" (which comes in four sizes,1-4)
Also he wears WWII Paratrooper Pants, which are modified called "rigger Made" with side pockets of pants added to look or hold more items for troopers.
also his M-1 grand belt, to hold rounds for M-1 grand rifle.....
Dont mean to sound so "LONG" about this stuff, but Im a WWII History guy, Living history,and collect Pre-145 War items...
SO if you guys need help in this Capt. America Impression I can help out!!!!!!