100% cotton. The Moleskin CPO Shirt is our version of an overshirt and could be one of the hardest working items in your wardrobe this winter. Crafted from thick, cozy cotton that feels plush to the touch, this shirt can easily take the place of a light jacket or can be worn as an additional layer. The side pockets ensure you have room for your small valuables and the chest pockets offer additional space as well. For a full moleskin outfit, there are matching pants also available from Highsnobiety.