Ensure you're keeping the liquid flowing in the Hydrate grey tank top from Casual Industrees and Rainier! The long-standing collaboration -- inspired by the two companies originating from the same building in the Seattle warehouse district -- continues with this striking tank, featuring large "Hydrate" script across the chest. The "R" in the word, of course, is replaced by the iconic Rainier R to finish off the striking look of this must-have tank top.