I was recently introduced to Tommy John Underwear and yes it is the most comfortable underwear I have used. It is lightweight Pima Cotton (there are several other material options) and after my long 9 hour drive from Vegas to San Francisco it was so comfortable and NON-sweaty. This will be my preferred travel underwear, yes it is pricey around $30 per pair but so is the Travel Underwear by Exofficio I where on my trips as well.
The Exofficio is a great for travel but has several drawbacks for me. It dries fast because it is made from Nylon (which is plastic) and causes me to sweat more often. The second drawback again being plastic material my pants/shorts tend to slide down more often because it is slippery. This is my experience and I continue to use them because I can pack light and they can be cleaned overnight and dry in the morning.
The Tommy John underwear is a great alternative because it is lightweight Cotton which will dry faster than traditional underwear which is non-lightweight. Also, they are so comfortable with their design which is needed for long flights. I cannot wait to use them on my next new non-stop flight from Los Angeles to Nanjing China. It will be a great test.
Travel Smart and Safe
Passionate for everything related to China travel.