I would also recommend EarGear. The other recommendation would be to have custom earmolds made to put over the end of the reciever. These will help keep the receivers (speakers) in you r ear better. Your hearing care provider should be able to get them for you.
The ReSound Linx instruments have a feature in them that won't prevent you from losing your hearing aids, but do have a feature to help you find them if they do become lost. The primary reason to get the Linx is because of their direct compatibility with the iPhone, for which you can download an app that gives you access to many features and tools, one of which is a "find my hearing aids" feature. Activating this feature in your iPhone, you can use it like a Geiger counter to track down your hearing aids. Using a "getting warmer" strategy, your iPhone can then lead you to your hearing aids, so long as the batteries in them are still good. If, however, the batteries have died, the app can give you a egenral idea as to where they were last located using the GPS in your phone.
Now, to prevent the hearing aids from getting lost in the first place, there are a few simple measures you can take. First, a good rule of thumb is that if your hearing aids aren't in your ears, they should be in the case you received with them with your original purchase. Another measure you can take is that your hearing care provider can order for you a special clip system that you can loop around the aids and then alligator clip them to your collar. These have been used for years with small children when they wear hearing aids. There's a special line of them called "Critter Clips," which have cartoons of animals on them, but there are also some that are very plain and inobtrusive for adults to use. The cost around $5-$10.
If you're into sports, there are also some special polyurethane head wraps that hold that aids to your head with holes over them that still allow sound to pass through. They come in a variety of colors, and are quite useful for anyone active in youth sports or adult intramural activities.
I would recommended looking into Ear Gear. They offer multiple options for active hearing aid users to both secure the hearing aids and help prevent excess moisture and debris from damaging the heairng aids. Your Audiologist should also be able to demonstrate this product, or you can find a provide on the Ear Gear website.
Loss prevention would be best served by an Otoclip or Ear Gear, as others have mentioned. The Otoclip is comprised of loops that you can tighten around each aid. The loops are attached to a string (comes in many color options) that has a clip in the middle of it. You clip the string to your clothing. If a hearing aid comes loose, it is still attached to you. Ear Gear are neoprene sleeves that cover the hearing aid to protect from moisture and dirt (which may also be a concern if you are active and perspiring often). The sleeves can be ordered with a string and clip attached to anchor the hearing aids to your clothing (just as an Otoclip does). Ear gear come in many fun colors, including camoflauge! Your hearing instrument provider can order these products for you.
If one of the hearing aids are lost, lucky for you, you have the Resound LiNX. The Resound Smart app, that can be downloaded to your Smart phone, has a GPS locator feature. It will show you the last place each hearing aid was when the battery was still active. There is a nearby mode for searching in a local area. There is a map mode, to search world wide.
We recommend otoclips which are adult versions of the critter clips mentioned in another expert answer. These cost approximately $5-15. I would probably suggest the binaural otoclip which hooks around each behind-the-ear portion and then clips to the back collar of your shirt. These are usually available by Westone, Oaktree Products or your local audiologist.
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