Nike Men's Basic Power Shorts XS Waist Size

[sherpa78]

Hey all,
I was curious: what is the waist size for an XS Nike Men's Basic Power Woven 7" Short: http://www.tennis-warehouse.com/Nike_Mens_Basic_Power_Woven_7_Short/descpageMANIKE-NMBPW7S.html

The apparel sizing guide for Nike Men's starts at S, with no mention of XS.

Thanks!