Duffle coats are water-resistant but not waterproof — and yes, they are genuinely warm. The dense wool construction repels light rain effectively — the kind of rain Britain delivers most of the time — but a duffle coat will saturate in heavy or sustained downpours. The same density that sheds drizzle is also what makes the duffle coat one of the warmest coats you can wear through a British winter. This is the honest answer, and understanding it is the key to getting the most from a Gloverall duffle coat in wet weather and caring for it correctly over the long term.
Boiled wool and Melton wool: how does each resist water?
Gloverall duffle coats are made in boiled and Melton wools, depending on the style and colourway — check the product page for the cloth used in any particular coat. The two fabrics resist water in slightly different ways.
Boiled wool is a felted fabric: wool that has been subjected to heat, moisture and agitation during production to create a dense, tightly matted surface with almost no visible weave. The felting process closes the fibre structure significantly, which gives boiled wool a higher natural water-resistance than most woven woollens. Light rain beads on the surface and runs off rather than penetrating. It is not waterproof, but it is among the most weather-resistant wool fabrics available.
Melton wool is a closely woven, smooth-faced fabric with a brushed surface. The weave is tight enough that light rain beads rather than penetrating immediately, giving it good practical water-resistance for everyday British conditions. It does not have the same surface density as boiled wool, but it performs well in the drizzle and light rain that characterise most British autumn and winter days.
Are wool coats waterproof?
No wool coat is fully waterproof — but wool is naturally water-resistant, and the resistance is structural rather than chemical. The outer surface of each wool fibre is covered in overlapping scales — the same scales that cause felting when agitated in hot water — and those scales naturally repel moisture. Wool also contains lanolin, a natural wax produced by the sheep, which adds a further layer of resistance. Unlike waxed cotton or technical fabrics, no chemical coating is required to achieve this — it is inherent to the fibre.
Wool has one more quality that matters in the rain: it can absorb a significant amount of moisture into the core of the fibre before it feels damp against the skin. That is why a wool coat carries you comfortably through a shower that would leave lighter fabrics clinging, and why the coat gives you a generous window of dry warmth before it starts to feel heavy.
This is also why wet wool has a faint, distinctive scent: the lanolin in the fibre releases when damp. It is not a sign of damage or deterioration. It dissipates as the coat dries, and the lanolin is part of what makes wool resilient in wet conditions in the first place.
The hood: the duffle coat's most practical weather feature
The duffle coat's wide, structured hood is one of the primary reasons the British Royal Navy adopted the design for sailors on Arctic and North Atlantic convoys. Unlike a peacoat or overcoat, which offer no head coverage at all, the duffle coat hood provides substantial protection for the head and neck in driving rain and wind. The pancake hood on the Men's Original Monty Duffle Coat and Women's Original Monty Duffle Coat — flat across the shoulders when lowered, structured at the front edge when raised — stays up in wind in a way that a lightweight hood does not. In genuinely wet weather, the hood is a significant practical advantage over any coat without one.
Duffle coat vs other outerwear in wet weather
| Coat type | Water resistance | Hood |
|---|---|---|
| Duffle coat (boiled wool) | High natural resistance; felted surface | Yes — wide and structured |
| Duffle coat (Melton wool) | Good natural resistance; dense woven surface | Yes — wide and structured |
| Peacoat (dense wool) | Good natural resistance | No |
| Waxed cotton | Highly water-resistant when re-waxed; coating needs regular renewal | Usually yes |
| Technical jacket (waterproof membrane) | Fully waterproof | Yes |
| Harris Tweed overcoat | Moderate; dense handwoven cloth | No |
Duffle coat vs waterproof jacket: what's the difference?
A fully waterproof jacket — using a laminated technical waterproof membrane — will stop water from penetrating in sustained heavy rain. A duffle coat is not built to that standard. It is built to be warm, durable and naturally resilient to the conditions a British winter typically delivers: cold, damp and intermittently wet rather than continuously drenching.
Built to a pattern the Royal Navy relied on for open decks — and named after Field Marshal Montgomery — the Original Monty carries a practical, working credibility that most wool coats never had. It is not a waterproof shell. It is a coat designed to handle difficult conditions with warmth and resilience, which for most British weather is the more relevant question. If you are walking in sustained heavy rain, a waterproof layer adds sensible insurance. For everyday urban and outdoor wear in British conditions, the dense wool construction is entirely adequate.
Every coat in the Heritage Collection is made in England at our factory outside London — you can read about how the coats are made on our Made in England page, and browse the full range in the men's and women's duffle coat collections.
Are duffle coats warm?
Genuinely, yes. The boiled and Melton wools used across the Gloverall range are, first and foremost, cold-weather cloths — thick, dense and heavyweight in a way lighter woollens are not. This is a coat built to a pattern the Royal Navy trusted on open decks in the North Atlantic; a station platform in January is well within its remit.
The details do a great deal of the work. The pancake hood shelters the head and neck. The throat tab closes the collar against wind. The shoulder cape adds a second layer of wool across the shoulders and upper back, exactly where the weather lands first. And the generous cut is deliberate: there is room for a thick jumper and a chunky scarf underneath without pulling the coat out of shape, so on the coldest days you can layer to your heart's content.
Wool itself does the rest. It keeps insulating even when damp — unlike cotton, which loses its warmth the moment it is wet — so a Gloverall duffle coat stays warm on precisely the days it is also doing its water-resisting work. Cold, damp and blustery is the weather this coat was designed for.
How to improve a duffle coat's water resistance
A wool-safe DWR (Durable Water Repellent) spray applied to the exterior of a clean, dry coat will improve the fabric's ability to shed rain beyond its natural properties. A few points on application:
- Apply to a clean, dry coat. DWR bonds to the fabric surface; applying to a dirty or damp coat reduces effectiveness.
- Check product compatibility. Use a product specifically formulated as wool-safe. Standard DWR sprays designed for technical fabrics can affect the natural lanolin in wool and alter the fabric's handle. Some DWR products require brief activation with low heat — follow the product instructions.
- Reapply seasonally. Once or twice per season during heavy use. DWR treatment is not permanent and diminishes with wear.
For the long-term maintenance of a wool coat — from replacement toggles to rope and buttons — Gloverall's Care & Repair collection exists for exactly this purpose: keeping a coat in service for the long haul rather than replacing it.
How to dry a wet duffle coat
If your duffle coat gets thoroughly wet, dry it slowly and naturally. Hang it on a wide, shaped hanger — not a wire hanger, which will distort the shoulder structure — in a well-ventilated room away from direct heat. If the coat is dripping wet, lay a towel beneath it to catch the runoff. Do not tumble dry. Do not place it on a radiator. Rapid or uneven heat will cause the wool to shrink, distort or felt, and will permanently alter the coat's shape and surface.
Boiled and Melton wools both take 24 to 48 hours to dry fully, depending on how thoroughly saturated the coat became. Ensure the coat is completely dry before putting it away — a damp coat stored in a wardrobe will develop mildew. Once dry, brush it lightly with a soft garment brush to restore the surface of the wool. And however wet it got, resist the urge to put a wool coat in the washing machine — if it needs more than brushing and airing, professional dry cleaning is the only route. For everything else — brushing, airing, storage and professional cleaning — see our wool coat care guide.
Frequently Asked Questions
Are duffle coats waterproof?
No — but they are water-resistant. The boiled and Melton wools used across the Gloverall duffle coat range both repel light rain effectively through the natural density and lanolin content of the wool fibre. In heavy or sustained rain, the coat will eventually saturate. For British weather — which is typically damp rather than heavily wet — both fabrics perform well for everyday wear.
Can I wear a duffle coat in rain?
Yes, in light to moderate rain. A Gloverall duffle coat in boiled or Melton wool handles the drizzle and light rain that make up most of a British winter without saturating. The hood provides additional coverage that no peacoat or overcoat can match. In heavier or sustained rain, a wool-safe DWR spray adds useful protection. Dry the coat slowly on a shaped hanger afterwards, away from direct heat.
Are Gloverall duffle coats warm?
Yes. Gloverall duffle coats are made in dense boiled and Melton wools — heavyweight cold-weather cloths — with a wide structured hood, a throat tab to close the collar against wind, a shoulder cape for extra coverage and a cut roomy enough to layer knitwear underneath. Wool keeps insulating even when damp, so the coat stays warm in exactly the cold, wet conditions a British winter delivers.
How do I waterproof a duffle coat?
You can't make a wool coat fully waterproof, but you can improve its water resistance. Apply a wool-safe DWR (Durable Water Repellent) spray to the exterior of a clean, dry coat. Use a product specifically formulated as wool-safe — standard technical-fabric DWR sprays can affect lanolin content and alter the wool's handle. Activate with low heat if the product requires it. Reapply once or twice per season during heavy use.
How long does a wet duffle coat take to dry?
24 to 48 hours, depending on how saturated it became. Hang it on a wide, shaped hanger in a well-ventilated room away from direct heat — never on a radiator or in a tumble dryer, both of which will shrink and distort the wool. If it is dripping wet, put a towel underneath to catch the runoff. Make sure the coat is completely dry before it goes back in the wardrobe.
Why does my wool coat smell when wet?
The faint, characteristic scent of wet wool comes from lanolin — the natural wax present in wool fibres that contributes to their water-resistance. It is not a sign of damage, deterioration or mildew. It dissipates as the coat dries. The lanolin is part of what makes wool naturally water-resistant and resilient in damp conditions — it is a feature of the material, not a fault.
