3M™ PELTOR™ HY80 Camelback Gel Sealing Rings

Expensive but worth it.

I purchased these for my Peltor Sportacs and I've noticed improvements in both comfort and noise isolation. I can wear these indefinitely now without noticing any discomfort. Interestingly, the 3M documentation states that the gel cups provide another 1.5db in attenuation across the whole spectrum. Whilst I can't verify the numbers, they definitely sound quieter now.