https://www.rei.com/product/859917/e...-mens-9-inseam
another vote for 9in inseam Ex Officio ~ they will ride up a bit.
I like my looser REI boxer-briefs as well. the looser-ness helps prevent them riding up.
- this is one of the more useful threads i've seen in a while.
I cannot say how well tehy'd fit other people, I imagine different leg shapes have different results, but I have the 6 inch version and it's long enough to prevent chafing, but they don't ride up - on me.