iASUS XSound 2.1 Helmet Speakers (for Arai, Shoei, HJC, Bell, Schuberth, AVG, Icon and other motorcycle helmets) : Amazon.co.uk: Automotive
Driver In-Helmet Speakers – Alex Reade Motorsport
Alta Wireless Bluetooth Helmet Drop In Headphones- HD Speakers Compatible with any Audio Ready Ski / Snowboard Helmet - 3 Button Glove Friendly Controls with Microphone for Hands Free Calls. : Amazon.co.uk: