Field shirt M91, Green

Origopro M91 Military Field Shirt – Official Finnish FDF Specification

The Origopro M91 is the legendary, multi-purpose raglan-sleeved field shirt famously issued by the Finnish Defence Forces (FDF). Origopro has proudly served as an official contract manufacturer supplying these shirts to the military for several years. Now, this exact same uncompromising, combat-proven quality is available to civilians.

The field shirt complies strictly in every detail with the official military technical specification and is crafted from the exact same fabrics and at the exact same production lines as the shirts supplied to active-duty troops.

Key Technical Features & Benefits:

• Advanced Thermal Regulation: The technical knit structure is engineered to efficiently wick moisture away from the skin, keeping you dry and warm during high-intensity operations in harsh climates.

• Flame-Retardant Safety: The fabric blend includes modacrylic, ensuring that the material does not support combustion. This flame-resistant property significantly enhances user safety compared to standard synthetic base layers.

• Tactical Design & Ergonomics: Features a 10 cm high ribbed stand-up collar that seals completely with a heavy-duty 4 mm coil zipper. The cuffs are securely ribbed, and the left sleeve is equipped with an official hook-and-loop (velcro) patch panel for rank insignia.

• Chafe-Free Flatlock Seams: Assembled with premium, flat flatlock stitching throughout. This eliminates friction and pressure points when worn underneath heavy backpacks, body armor, or load-bearing vests.

• Extended Tail Drop: The torso is deliberately tailored longer than standard shirts. This ensures the shirt stays tucked firmly into your trousers and won’t ride up during dynamic movement.

Versatility & Sizing Advice

Designed for multi-season performance (winter, autumn, and spring), the M91 functions perfectly as a heavy base layer or a mid-layer. In sub-zero temperatures, it pairs seamlessly under a combat fleece, while in milder weather, it serves excellently as a standalone outer garment.

Sizing Note: The shirt features a generous military cut combined with a highly elastic knit. Do not size up -choose your actual standard size.

Technical Specifications & Care:

• Material Blend: 50% Polyester, 33% Cotton, 17% Modacrylic (flame-retardant fiber)

• Weight: Approx. 330 g (Size M)

• Size Range: Available in 7 sizes (XS–XXXL)

• Colorways: Olive Green (Army) / Dark Navy Blue (Navy)

• Care Instructions: Machine wash at 60 °C, tumble dry medium (two dots) allowed.

• Country of Manufacture: Estonia

The sizing is loose fitting so no need to “size-up”

Measurements:

	Size	1/2 chest	Front length	Shoulder+sleeve
	XS	37 cm	63 cm	73 cm
	S	41 cm	65 cm	75 cm
	M	45 cm	67 cm	78 cm
	L	49 cm	69 cm	81 cm
	XL	53 cm	71 cm	84 cm
	2XL	57 cm	73 cm	87 cm
	3XL	61 cm	75 cm	90 cm

Back is 8 cm longer than front.