I use "EAR" brand "ear-soft". I got them on Ebay, and they have one of the highest noise reduction ratings (I think its 33dB)and are comfortable for long periods. My neighbors play basketball and the court is close to a window where I meditate, and they have a race car engine they rev-up for long periods. It doesn't completely block out that stuff, but helps a lot. I haven't mastered shutting off my senses yet. Etherfish