VENTILATION — Velocity Flow Ventilation™ and FlowAdjust™ Front Vent Slider. Material Composition. Hat Size (IN). AND HOW SUCH IS SUBJECT TO. L 59-60 23" - 23 1/2" 7 3/8" - 7 1/2" 30 mm. M 57-58 22 1/4" - 22 5/8" 7 1/8" - 7 1/4" 30 mm.
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