The liner is fully removable and machine washable. In addition to these features, this helmet comes fully equipped with improved Bluetooth 2. 0 technology to insure compatibility with your Bluetooth enabled cell phone, android, or iPhone. With two built in speakers, up to 8 hours of continuous talk time and 150 hours of standby time, the T27B allows you to receive and send calls, listen to stereo music streaming from your MP3, phone, or XM radio, as well as listen clearly to GPS directions (Incoming cell calls automatically override other communications, but the new call reject feature can limit interruptions). Combine two or more BLINC enabled helmets, and enjoy communications from rider to passenger, and passenger to rider (intercom), or talk bike to bike (2-way communications within 100 feet). Other features include a noise cancelling microphone, full duplex communications with DSP Filter, Self-adjusting volume, glove friendly and waterproof controls.