Just wore this to the beach over a holiday weekend.  Normally, even with sunscreen reapplication, my neck/chest still burn easily.  With this scarf on, my shoulders got a little burnt (even with several sunscreen re-ups) but my neck and chest are just as bright of white/pale as when I set foot on the beach so I'd say it works!  I even flipped it around to cover my back when sun changed directions, and it helped out there too.  I plan to keep it in my purse for throwing on when the sun surprises out on regular walks.