NEW FOR 2020 - The ACS PRO-Fit offers complete versatility as well as incredible sound. One of the smallest, lightest earphones on the market providing the highest levels of sound quality and isolation. The PRO-Fit single balanced armature driver gives remarkable high-fidelity accuracy with smooth bass and sparkling high frequency response. It’s ready to use straight from the box and comes with its own soft carry-case and a selection of interchangeable earbud tips that can be used to get the best fit for your ear. PLUS! The other unique advantage is that the PRO-Fit earphones can be easily retro fitted to any ACS PRO Series custom earplugs to instantly convert into a pair of custom fit in-ear-monitors.