Those clips are passive...they only keep your baseball cap attached to your shirt.
They do not guarantee your dermatologist's pleasure at seeing your cap remain on your head.
(And where's the sun protection if your cap is turned backward?)
I found Capsurz (
www.capsurz.com ) , a patented product that is guaranteed to keep your cap on. According to the testimonials convertible drivers, anglers, bikers, boaters and other folks who encounter windy situations swear by them.
I like that they're functional and look good on the brim of your cap. Another nice thing about Capsurz is that your hair doesn't get caught in them (they are not alligator clips like the ones previously mentioned); you don't even feel them. Capsurz do what they say: they windproof your cap.