This looks like it would be fun for beach or urban riding. It's a 2-ply tire that is supposed to weigh about 1000 grams.

Roads are finally at least semi dry after being covered in salty brine since last fall. It was time to mount the Fattyslicks on carbon 100mm rims and do some hillclimbing at a popular Strava spot. Mounted them tubeless w/o sealant, and both held decent pressure overnight. Pumped them to 20psi before the ride. The front held up fine w/o sealant, but the rear started leaking, so was down to a mushy 6psi after a short while. Pumped up to 20psi with the Lezyne mini pump, and the bike was flying again, but it dropped to 6psi when I hit the climb.Y'all know that this tire was specifically designed for our resident mad scientist in Norway?You know he's going to take that tire and beat all the roadies in a metric century race with 100mm carbon rims no less!
Just you watch.
Yep, it is 4.9 on a 100mm rimwait , they are making a 4.9 already?