Very cool product. You can get a similar effect to these isolation+masking plugs by wearing normal earplugs and then playing loud masking sounds externally (either over speakers in the same room, or through over-the-ear headphones).<p>On planes, for instance, I wear headphones over my earplugs and crank up the volume to watch movies. It's the poor-man's noise-canceling headphones! If you can, also turn up the treble to try to flatten out the combined frequency response of the plugs+phones.<p>Obviously my hack doesn't solve the same problems this product does, but it's a trick I've found useful.