The same friend that found the amazing Octomore gave me a pair for my birthday a few years ago, and I've been addicted since! Total Wine has them here in AZ, so a new set is always at the ready to replace any mishaps. The same dude (lad, perhaps?) that designed then is responsible for the original Octomore distillations... Jim McEwan.
Math/physics Nerd alert.... the interior shape is very similar to cooling towers for nuclear reactors and such... a modified hyperboloid 

 It facilitates natural convection to bring the aroma up, with a subtle swirl from the helical vanes. It's also naturally strong in the vertical direction, which doesn't help a glass much, but rocks in a smokestack or cooling tower. The double wall maintains internal temperature, and they are fun to swirl so whisky in and admire 
 
I think it was a kickstarter thing originally, but you should be able to find them with a bit of a search. Cheers!