Beach Flag (as you can see) can be used not only in summer but also in winter. So itís  actually  better to call them as well flyer, winder, batfan or bowflag.
Flagi   Flags    Fahnen   Drapeaux  Flaggen   Flagga
P2150036 flayer zima5 flayer zima3
flayer zima4 flayer zima6 beachflag