You will often find "SONE017" as part of the Manufacturer Part Number (MPN) for high-end protective gear, specifically their Lifer Helmets The "Top": In this context, the "top" refers to the outer shell or the sizing liners
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"I bought the standard version first, then upgraded to the SONE017 Top. The difference in the audio mix is night and day. You can hear the ambient room tone and subtle movements you miss in the stereo mix." – You will often find "SONE017" as part of