POC has teamed up with Harman Kardon to create the Obex Connect, a helmet with built-in speakers along with mesh communications. They're the best-sounding ski helmet speakers I've tried.

See at Backcountry.com Alas, these aren't speakers you can add to any ski helmet. The headset is sold as a $300 accessory for any of POC's Obex helmets, or it's available in POC's $550 Obex ...