For me its sweat management. Regular cotton underwear just gets too wet when it is 90 degrees outside.
I've not been able to tell any difference in performance between $30 Under Armour and $10 Wal-mart.
Biggest issue is length. Compression shorts vary in length by a considerable amount
Originally Posted by Boricua
What is the purpose of compression shorts?
Chris recommends Skins, what other brand is good also? (sold by TW of course