^this is what new era europe says...
"TOO TIGHT?
What happens is the sweatband does its job and collects any moisture when you are wearing the cap. Without a head to hold its shape and size, it will shrink asit dries. For starters, grab your cap from the rear of the cap, place it over your knee and give a good hard yank. You will hear some popping noises.That's O.K. Stop pulling after you hear a couple of these noises. If you pull too hard and too long, you could rip a seam. We DON'T want that!! Whatyou are actually doing is breaking the sizing, which is a stiff plastic strap that we sew into the cap for shape and size maintenance."