I have what I would like to call the normal ear size, my husband's ears are a little bigger, my kids ears are a little smaller. The EP3 is very large feeling in my ear, we sent these back and went with the EP4 size medium and it's much more comfortable. The EP4 works very well, drowns out a lot background noise so that you can focus on a conversation It was something that worked very well for me when I was having a chronic lyme flare up and having extreme sound sensitivity. I carry these on my keychain now. My husband takes a pare of the EP4s with him when he goes away.on business to drown out the noises at night as well as other people snoring. LOVE THEM, just didn't love the EP3's.