Chambray blue Men's crewneck short sleeve tee by Lululemon. Unfortunately I do not know the exact style name of this tee. Has a slightly longer hem line in the back than in the front and small slits on the sides. Cotton blend fabric. Material has a purposeful faded-out look. No size tag or dot but this measures out to a men's XL according to size charts on their website. Across chest area measures 22.5 inches.