The first air pair of electronic muffs I bought were Peltor and they are OK, but don't drop noise enough in my opinion. I then bought the Howard Leight Pro electronic muffs and found that they gave much better noise reduction, especially with noisier calibers such as 357 Mag and 44 Mag and I didn't have to use inside the ear foam plugs along with the ear muffs like with the Peltor e-muffs. The only down side to the HL Pros were they are on the bulky side, which works against you when shooting rifles. But I have found that I can work around the bulkiness issue with them when shooting rifles.