The product is a Brooks Brothers Regent Shirt for men in size XL, made from 100% linen in a blue windowpane pattern. This long sleeve button-up shirt features a collared neckline, button accents, and is designed for occasions such as travel, parties, or casual wear. It is a classic and preppy piece that is breathable, non-iron, and suitable for all seasons. The shirt is machine washable and has a regular fit, making it a versatile and stylish addition to any man's wardrobe.