A 'Mask' for the end of the flute (aka 'flute sock' or Flute Boot) - YouTube
Solid Flute Mask — The Final Touch Company
Hmong Flute Crew Socks - XIXOmenswear
Whistle & Flute - Kawaii boot socks are cozy, cute and will keep your feet nice and warm as the weather cools down! Kids sizes have anti-slip grips and they also come