How about these for long-distance training like ultramarathons and LSD runs? These shoes use Vibram's "morflex HAE rubber outsole" and feature an integrated midsole and outsole for lightweight performance and abrasion resistance. They've been used for less than 150 kilometers and are still in good condition. I will strive for a quick and courteous response. Thank you. Keywords: The North Face Ultramarathon Marathon Running Trail Running