In reply to DaveHK:
thats a bit of a frankensteins shoe going on there!
For me I find Injinji socks work well, even though they are thin I dont get any blisters.
Im yet to find a shoe that works well for me on mountainous terrain and for ultra distance.
Oddly enough I was just thinking of starting a post similar to this so Ill hop on here!.
how long are you talking about for 30h only asking as some people take 24h to do a 50 whereas others can do 100 miles in that time.
Broader based shoes work for some for ultras e.g new balance leadville, Hoka, or like my Saucony excursion tr8, but then you compromise sole comfort for grip and trail feel. Ive met others who can run an ultra in Inov-8 X-talons, so each to their own. as Dave said youll just have to experiment.
A decent website for reviews is runrepeat, but it still depends on what sort of mountainous terrain you mean, if in the uk then chances are itll either be wet rock or wet grass, or if in warmer climates you may not need wet grip.
Post edited at 18:36