Just like chocolate chip cookies, the slub fabric technique was born from a happy accident. But now, the 'imperfect' aesthetic of cotton slub makes every garment one-of-a-kind. Each Duluth Slow With the Flow Long Sleeve Shirt is subtly unique, which means you might as well grab more than one. This super comfy 100% cotton shirt is made to hang loose, with a droptail hem and side vents that give you freedom of movement. This is everyday casual wear to the letter.