I don't use them but in the meantime you could double up, meaning ear plugs with muff's over them. You could always check
www.midwayusa.com or
www.brownells.com and read up on the reviews people left for certain models. You two are smart for wanting to protect your hearing. Not only can you suffer hearing loss, but loud noise exposure can lead to tinnitus, or permanent ringing in the ears. I have it and it is no fun, and for some people it can seriously affect their quality of life. Getting to sleep without a fan on is hell for people suffering from tinnitus.