Marathon all the way. My friend used to work there and I was skeptical, but am now a believer. 100,000 miles with them on my current truck and I haven't had to adjust them once and have no tears, rips, etc. That is with a giant lab and two little kids tearing through it daily. My previous truck also made it about 100,000 miles with a set and never required adjustments and never had any rips/tear/wear. They are the Kifaru of seat covers.