I recently bought a new pair of swim trunks (Columbia brand). I wore them once and cut out the lining because the mesh was so uncomfortable. I have done the same thing on my son's trunks. We wear Under Armor compression shorts under our swim trunks...but that is not a great solution on a hot day. If Dry Dudz has a comfortable liner that wicks moisture, you have a nice product position.
Look at the model golf apparel designers took about 20-30 years ago – make clothes that you would want to wear even if you weren't golfing. The same can hold true for swim apparel.