NXT NXTRNDNxtrnd XTD Scrunch Football Socks, Extra Long Padded Sport Socks for Men & Boys

My son has thick calves, so i am concerned about how wide do these socks stretch. what is the maximum circumference for the size l/xl?

What size do i get for boy size 5.5?

How many do you get? 1 pair?

Are these socks thicker then regular socks? Cause my cleats are tight