First, as others have said, all but one style of helmet WILL fog up if you’re standing still. It’s air flowing through the vents when you’re moving at speed that de-fogs your visor.
Second, Shoei (and Arai) both have pinlock visors which NEVER fog up…EVER. Seriously. They’re amazing. The way it works is that the outer shell (what would normally be the whole visor) has two little pins on either end. You attach a soft silicone-y insert on the inside using the pins to keep it in place. Voila! No fog.
This is the pinlock visor (no insert):
http://www.shoei-helmets.com/store/product_info.php?cPath=36_33_87&products_id=1642
There are many different colors of visor available, but I recommend you ONLY get clear:
http://www.shoei-helmets.com/store/product_info.php?cPath=36_31_77&products_id=1639
The reason is that the colored insert doesn’t cover the whole visor and so a dark smoke insert, for instance, can fail to keep the sun out of your eyes when the sun gets through the clear outer visor around the insert. I almost crashed once when I came around a turn and was unexpectedly blinded for precisely this reason. Turns out there was a woman parked perpendicularly in the middle of street. Who knew. I haven’t used the smoke insert since, and have gone back to a full smoke visor when it’s sunny.
But seriously, if you have the $$$ (about $70 for shield+insert), the pinlock system will never fog up on you. I mean never. You can try your indoor sitting still test again and you’ll be mind-blown.