Check out his shoes at around 4:52 of this video, the first in a fascinating series on Youtube titled Lasse Viren Annat vain kaiken osa.
http://www.youtube.com/watch?v=ojh0k83QavI&feature=related
They may be the old Tiger Cortez's, but they look even thinner than those. And he ran 150 miles/week in them.
Here's to the only distance runner ever to achieve the Olympic double-double.