In 2017 the Seattle Sounders are retiring the cursed Olympic Whites and releasing a new alternate kit. Their primary will remain the Rave Green with blue sleeves. The Pacific Blue third kits remain, for this year, as well. The release date has remained hidden, until now.
This signage showed up in White Center near Taqueria La Fondita recently, and mentions Thursday, February 23rd. The team will be in Charleston for the Carolina Challenge Cup from the 16th to the 25th.
It matches previous hints that the alternate kit would be inspired by the club’s NASL history.