The Liquid Carbon Ruby is no diamond in the rough. It's your centrepiece of style and protection. A glossy carbon finish intertwined with a cosmic red colour tone helps deliver a pristine grade of safety for every rider.While originally an amulet associated with kings and queens, the Liquid Carbon Ruby brings you powers from a much more supreme being. Are you ready to find out?The AT4.0 full-face motorcycle helmet ticks all the boxes for safety, comfort and style. Composed of multi-layered, multi-density foam, our tailor-made cheek pads intelligently contour around your face for a custom fit.The AT4.0 headliner has been enhanced with RHEON technology that helps reduce impact and rotational forces using reactive polymers for increased energy dissipation. Fully ECE 22.06 certified, the AT4.0 is our safest helmet yet.The streamlined carbon fibre shell features fully adjustable front and top vents for precise temperature control and improved acoustics to reduce turbulence and wind noise.The AT4.0 is a fully Bluetooth compatible motorcycle helmet when used with the Shockwave Bluetooth audio insert (sold separately). Featuring sound engineering by Harmon Kardon, the Shockwave integrates seamlessly into the AT4.0. Your AT4.0 can be customised with our range of helmet visors. We offer seven additional coloured visors that can be changed in a matter of seconds with our tool-less thumbscrew mechanism. Your AT4.0 comes as standard with a clear visor installed and a tinted visor included in the box.