The St. John's Bay Lined Men's Flannel Fleece Shirt Jacket in size M features a classic plaid pattern with a collared neckline and long sleeves, making it perfect for casual occasions during the winter, fall, and spring seasons. This blue shirt jacket is made of soft cotton flannel with a button-up closure and button accents, along with lined interior and pockets for added functionality. The regular fit and easy care with machine washability make it a comfortable and versatile addition to any man's wardrobe.