The High Energy Light Isotope eXperiment (HELIX) is a balloon-borne magnet spectrometer which seeks to address critical questions in cosmic ray physics by measuring the chemical and isotopic abundances of key light isotopes in the cosmic ray flux. One such measurement, that of the ratio of Be-10/Be-9, will provide strong discrimination between cosmic ray propagation models. In its first of two planned flights, HELIX will measure these abundances up to the ~3 GeV/n region. The instrument consists of a 1T superconducting magnet, a gas particle tracking system placed in the bore of the magnet, an aerogel RICH with a focal plane made of Silicon Photomultipliers (SiPMs), a scintillating fiber hodoscope, and a scintillating paddle time-of-flight system. This talk will cover the design, construction, and calibration of HELIX's novel RICH as well as a brief overview of HELIX's payload.