Wanting to let you know about Caussie. These are Australian nylon men's swimwear, which are inspired by where all of this started from ~ the original men's nylon Speedo.
So, if you like speedos, these might suit you, they may even become your favourites, or at least an favoured addition to your collection. They use the 100% nylon, without any lycra or spandex component, and the fabric is lightweight which looks and feels good. Anyway, have a look at the photos on http://www.caussie.com.au
Yes, you can use them as underwear as well.
And, yes, I do have an interest in Caussie. I have them made here in Australia. It took a long time and much perserverance to get there, but I finally located a top designer, with a background in the manufacture of the original speedos, who was able to put together my design into a lightweight racer style brief that captures the essence of the original speedo. Then, I was able to get one of the best swimwear manufacturers in Australia to put it all together, using flatlock stitching - just as used in the original speedos.
I think it works! Hope you do, too....
All the best,
Caussie
http://www.caussie.com.au