The Lululemon Men's Masons Peak Flannel Plaid Long Sleeve Shirt in red and black is a stylish and comfortable button-up shirt perfect for casual wear. With a regular fit and long sleeves, this shirt is ideal for men looking for a colorful and versatile addition to their wardrobe. Made from cozy flannel fabric, this shirt features a classic button closure and is available in size M, making it suitable for everyday wear.