Description of Boeri Radioactive T - Audio Dropliner for Tactic Helmets Since 1989 U.S. wintersports enthusiats have turned to Boeri for their productive headgear needs. Their innovative designs, world renouned quality, great off-the-shelf fit and wide assortment of colors and styles are a few of the reasons Boeri proudly remains the leadrer in wintersports helmets. The Boeri Radioactives T are an audio-enabled Radioactive Drop liner. This liner replaces the existing drop liner/ear covers in your Tactic with Radioactives. Drop in the Radioactive and you're wired for sound. A volume control switch and mute button are standard. Features: Compatible with Boeri Tactic helmets