BarracksSi-

I bet you have tried a number of products so far. The shooting sports have lots of headphones that also have microphones to let in ambient sound. The principle is that the headphones provide 25 plus decibels of noise reductions, the electronics modulate any sound coming in from the speakers and keep sit below 80 - 85 decibels. I have a set of these, I find them hot to wear even while just shooting, so I wouldn't consider them with summer riding. Cost is $75 to $125

There are makers of custom molded ear plugs that also put in electronics similar to the headphones. They are pricey. ProEars? I think they are called, and are usually marketed to hunters who want to hear game but not the gun blast.

There are custom molded ear plugs that have baffles to let is some noise as well. I have spent a lot of time with regular custom molded ear plugs in my ears while in the shooting sports. They are generally comfortable, I have been able to have conversations with them in, both with people that have plugs in and people that don't. They fit well enough so that I could partially pull them away from the ear canal to let in some more sound without having them fall out, and would only have to push them back in if it got noisy again. Since I find I can wear them for hours at a time, you might enjoy investing in a pair.