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Update your closet today with Theory. Shop all the latest designer t-shirts in our selection. Available in a wide range of colors and styles, these t-shirts are designed to last. Look to Theory's range of t-shirts for a simple way to lift your outfit. Effortlessly cool and well-crafted – Theory's t-shirts deserve a place in every wardrobe. Cotton t-shirts need to be cared for properly to ensure they stay looking their best. To keep cotton looking its best we would advise following the instructions on the label carefully to ensure the longevity of each cotton piece. Cotton is not only comfortable, but easy to care for too. It’s simple to care for too, and most pieces can be washed in the machine at 30°C unless specified otherwise on the care label. If the cotton item is coloured, turn inside out before cleaning. Once washed, gently stretch garments back into shape and always air dry flat away from direct heat. Discover our selection of men's designer clothing from Theory to find your perfect look.