The woman behind ThunderpantsUSA is a shop owner in Portland, Oregon, who sold so many pairs of Thunderpants that she decided to close her shop and make Thunderpants in her home town.
How's that for a testimonial? 
But why would she do that??? Because Thunderpants have a history: They've been making them in New Zealand for almost 25 years, and the time was right to make them in the United States. 
The fabric is an organic-cotton/spandex blend with a super comfy, super soft, nice & stretchy feel. And there's no elastic, which makes them even more enjoyable to wear. No wedgies. No riding up. No panty lines. And each print is designed by artists and limited edition, so they're collectible.
p.s. Check out what a very cool celebrity said about Thunderpants: click here to see who it is. THUNDERPANTS ARE NOW AVAILABLE FOR MEN, TOO, IN SUPER-COMFY BOXER BRIEFS.