These headphones were so sought after here in Japan that for many months supplies were strictly rationed. Sony clearly underestimated demand and could not keep up.
Supplies are now plentiful.
You no longer need to look or feel silly with home headphones that neither go under a hat nor over it comfortably. No, what you have here is a headphone strap that goes behind your head, countoured around and below your occiput. The phones are supported by your ears themselves, and are unbelievably comfortable. Best of both worlds. And the sound is good.