Industrial Health  
   Industrial Health provides OSHA audiometry (hearing testing), respirator clearance evaluation, and respirator fit testing (US).
   http://www.indhealth.com

E.A.R. Inc.  
   Presents a broad line of hearing protection products including a range of passive and active ear plugs.
   http://www.earinc.com/

Hearos  
   Ear filters and guards for noise, water and wind protection.
   http://www.hearos.com

Electronic Shooters Protection  
   Provides custom, in-the-ear hearing protection for shooters, instructors, hunters, and outdoorsmen. Permits hearing the safe range of sounds but not damaging noise.
   http://espamerica.com

EarPlugsOnline.com  
   Offers NRR 34 rated reusable ear plugs that block out water as well as sound.
   http://www.earplugsonline.com

Silencio/Safety Direct, Inc.  
   Silencio and Rig products featuring hearing protection and safety glasses.
   http://www.silencio.com/

Jaco Enterprises  
   Offers a neoprene ear cover as well as moldable plugs to help prevent swimmers ear.
   http://www.earbandit.com/