| 摘要 |
A cap having a head band and a brim. An expandable tube is mounted inside the head band and an air pump is mounted on the brim and connected to the tube. An air release valve is connected to the tube and is mounted on the outside front of the cap. Whereby the cap may be adjusted to different sizes by pumping air into the tube. The pump being an air cushion mounted on the brim of the cap having an entry valve to provide for entry of air to the tube, so that the pump and release valve maybe operated to fit the cap while the cap is on the user's head.
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