The Weatherproof Men's Long Sleeve Flannel Plaid Shirt is a classic casual button-down shirt featuring a comfortable flannel fabric in a traditional plaid pattern. Sold exclusively at Costco, this shirt offers a relaxed, versatile style suitable for everyday wear, weekend outings, or casual layering.

The shirt features a button-down collar, a left chest patch pocket, and a full button front placket. The long sleeves provide warmth and coverage, making it ideal for fall and winter casual wear. The plaid pattern combines rich tones such as red, navy, and burgundy for a timeless look.

Available in extended sizes including XLT (Extra Large Tall), the shirt is designed for a comfortable fit across a range of body types. Weatherproof is a well-known brand recognized for durable, weather-resistant casual and outdoor apparel.