70% cotton, 30% linen. This is a 7/8 sleeve check shirt in shades of blue-green, white, and navy. It's thin, soft, and has a smooth feel. It's very useful as a light layer to protect against air conditioning in mid-summer, or as a light jacket during the changing seasons. I bought this for my husband, but it doesn't fit, so I'm selling it. Please note that I may have overlooked something as I am a private seller.