Stylish Short Brim Design Removable Vent Plug System Removable Ear Pieces for Additional Ventilation Audio Compatible Radioactive V Weight 14 ounce Boeri Siren Ski and Snowboard Helmet for Women is an audio compatible, micro shell, in mold design helmet for women. Weighing a mere 14 ounces, the Siren is the lightest helmet in Boeri39s Women39s Line. The short shell design, with removable vent plugs and ear pads, offers multiple ventilation options. With nine passive chimney vents you can choose the exact amount of ventilation you like and need. With an extremely stylish short brim design, vibrant color choices, and a universal fit, the Siren is a top seller. New this year is Boeri39s Pony Port. This addition helps manage long hair without sacrificing style and comfort. The Pony Port gives you a soft, simple way to keep your hair at bay. The Siren is compatible with the Boeri Radioactive V Audio Dropliner. The Radioactives get you wired for sound. The Boeri Radioactive V is not included.