A boundary layer flow regulator, called a dam, is fastened, by way of example, to a bicycle rider's head band and is located against the temple area. The dam includes a fine permeable maze which viscously impedes but does not arrest the air flow through it. The maze is held in place by a supportive but flexibly resilient, wind permeable matrix attached to a base. On a calm day the relative headwind experienced by the rider is stabilized by the maze held in position by the stilled matrix so that a stationary flow envelope forms around the rider's ear canal to eliminate wind noise. However, on a windy day the preturbulent gusts in the headwind cause the matrix to instantly shift the position and permeability gradient of the maze so that the flow envelope is dynamically regulated around the ear canal to minimize the infranoise caused by the gusts.