Diamond Dye Pitch Grey Graphite Grey - perfect condition Focus. Focus. Focus. Our versatile Cool Racerback tank, powered by Nulu™ fabric, has a contoured fit so it stays put (and out of your way). nulu™ Lightweight, buttery-soft Nulu™ fabric wicks sweat and is four-way stretch buttery-soft handfeel lightweight sweat-wicking four-way stretch