Who cares. Spira is not a serious running shoe company and their product is quite crappy. If you don't believe me, go to your local pedorthic account and try them on... Wal-Mart quality.
there was a study that was commented on in an article on msnbc.com or fox news, cant recall which, within the last couple days. they did a study of running shoes and found very little diff in quality b/t no name brands and big name shoes. it also found very little diff in quality based on price.
if i can find it again i will post a link.