| 摘要 |
A baseball cap including features for stabilizing the cap in a moving stream of air. The cap includes a modified bill having a downforce generator configured to create a relatively stagnate recirculation zone between the downforce generator and the head covering. This recirculation zone tends to negate the lifting effect found in prior art bills. The invention preferably also includes a vent through the bill. The vent is located behind the downforce generator, so as to connect the underside of the bill to the recirculation zone formed in the wake of the downforce generator. The vent is selectively closed by a flexible flap. The flap remains closed to prevent rain from passing through the vent. However, if pressure beneath the bill significantly exceeds pressure above the bill, the vent opens to equalize the pressure. This action prevents the creation of a net lifting force which might lift the cap off the wearer's head.
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