Filson Field Flannel Shirt Brown / Marsh Mallards

The Filson Field Flannel Shirt in Brown Marsh Mallards is a rugged, soft, and dependable flannel built for comfort in cool conditions. Combining Filson’s workwear heritage with a distinctive outdoors-inspired print, it’s a shirt designed for the field, workshop, or campfire that feels broken-in from day one and built to last for years.

Made from 6.8-oz brushed cotton flannel, the fabric offers an ideal balance between softness and durability. The midweight weave makes it warm enough for layering during the colder months while remaining breathable and comfortable indoors. Each shirt is brushed on both sides to create a smooth, lived-in texture that delivers exceptional comfort against the skin.

The classic cut allows for easy layering over a T-shirt or under a jacket, while still maintaining a flattering silhouette. Button-adjustable cuffs and a pleated back yoke enhance mobility and fit, ensuring unrestricted movement whether you’re at work or outdoors.

The dual chest pockets are secured with button flaps — a signature Filson detail — providing practical storage for small essentials. Reinforced stitching throughout ensures long-term durability, staying true to Filson’s legacy of making garments that outlast the seasons.

The Brown Marsh Mallards print gives this version of the Field Flannel Shirt its distinct personality. Inspired by classic hunting motifs and Pacific Northwest heritage, it captures Filson’s connection to the outdoors through rich brown tones and subtle duck graphics. The result is a unique blend of functionality and character — traditional, rugged, and quietly expressive.

From fieldwork to weekend wear, the Field Flannel Shirt exemplifies the timeless appeal of Filson’s craftsmanship: reliable, comfortable, and purpose-built for those who live close to the outdoors.

Key Features

• Fabric: 6.8-oz brushed cotton flannel — soft, warm, and durable

• Construction: Brushed on both sides for comfort

• Fit: Classic cut for layering and movement

• Details: Pleated back yoke for mobility

• Pockets: Two button-flap chest pockets

• Cuffs: Adjustable for comfort and versatility

• Pattern: Brown Marsh Mallards — heritage outdoor print

• Durability: Reinforced stitching and high-quality buttons

• Use: Everyday wear, fieldwork, or casual layering

Size Chart