Nikwax | SKU: 241P12

Down Proof Wash-In Waterproofer

€11⁰⁰

Volume

300 ml

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Description

Specialty waterproofer designed to protect the insulating properties of down-filled gear from wet and damp conditions. Easy to use in the washing machine or by hand, non flammable and PFAS free.

For waterproofing down

Easy to use wash-in waterproofing for all down clothing and sleeping bags.
Adds water repellency and revitalizes insulation.
Enhances the performance of your down gear, keeping you warmer and drier.
Recommended for Nikwax Hydrophobic Down, Hydrodown^™ and all other down clothing and sleeping bags.

Suitable for:

Down Jackets
Sleeping Bags

Specifications

Specs
Why Down Loses Its Warmth When Wet
Down is prized for being light, compressible and incredibly warm. It works by trapping air between its fine filaments, which your body heat then warms to create insulation.
But when down gets wet, the filaments clump together. Loft is lost, meaning the down can’t trap air effectively. Water also conducts heat up to 25 times faster than air, so once wet, down rapidly loses its insulating power. Wet down also becomes heavier, less breathable and leaves you feeling cold, damp and uncomfortable.
Why Water Repellency Matters
To keep down gear performing, you need to stop it from absorbing moisture. Both the outer fabric and the down fill require Durable Water Repellency (DWR) to stay warm and breathable. Over time, this DWR coating wears off through use and washing, and must be renewed with Nikwax Down Proof™.
Down Is Best in Cold, Dry Conditions
Down’s unique ability to deliver maximum warmth with minimum bulk makes it ideal for jackets, gilets and sleeping bags in cold, dry weather. But rain, snow or even condensation from sweat will cause it to collapse and lose insulation. Treating your gear with Nikwax Down Proof™ restores DWR to both the outer fabric and the down fill, helping it resist water while maintaining loft, warmth and comfort.
When to Use Nikwax Down Proof™
If your down jacket or sleeping bag starts absorbing water, first clean it with Nikwax Down Wash.Direct®. For newer or recently treated gear, this may be enough to revive the DWR. But after extended use, you’ll need to reproof with Nikwax Down Proof™ (applied after cleaning with Down Wash.Direct®). This treatment restores repellency to both the shell and the down itself.
Why Choose Nikwax Down Proof™
- Specifically designed for down-filled gear.
- Adds DWR to both fabric and down filaments.
- Maintains loft and insulation instead of flattening the down.
- Water-based, PFC-free and non-flammable: safer for you and the environment.
- Prolongs the life of your gear while keeping it breathable and comfortable.
How Nikwax Down Proof™ Works
Nikwax Down Proof™ coats each filament and fabric fibre with a flexible, water-repellent treatment. This allows sweat vapour to escape while blocking rain and condensation. The result: down that stays lofty, light, warm and protective even in damp conditions.
Ideal for

Everyday

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How to use

Nikwax Down Proof Wash-In Waterproofer

Machine Wash

Important: Remove all non-washable parts and clean items first with Nikwax Down Wash Direct®. Always wash and proof in separate cycles. Do not dry before waterproofing. Shake bottle well. Follow care label instructions.
Remove all detergent build-up from the detergent dispenser.
Place a maximum of 1 clean item in the washing machine.
Select a 30°C synthetic cycle on a slow spin, with an extra rinse if possible.

Dosage – Clothing

Add 150ml of Down Proof to the detergent dispenser.

Dosage – Sleeping Bags (8kg+ washing machine)

150ml for 1-season bags (0.8–1kg)
300ml for 2–3 season bags (1.1–2kg)
500ml for 4-season bags (2–2.5kg)

Hand Wash

Important: Always clean items first with Nikwax Down Wash Direct®. Do not dry before waterproofing. Shake bottle well. Follow care label instructions. Wear gloves.

Clothing

For 1 item – use 150ml in 7.5L of water.
For 2 items – use 300ml in 12–15L of water.
Immerse clean items in warm water, agitate to mix and ensure complete wetting.
Rinse in cold water until water runs clear.

Sleeping Bags

For 1 item – use 300ml in 12–15L of water.
Agitate to mix, leave to soak for 5–10 minutes, then agitate thoroughly.
Rinse in cold water until water runs clear. Repeat if needed.
Drain and gently press bag to expel excess water.
If care label allows, tumble dry on a low setting until clumps have disappeared. Tease clumps apart during drying to restore loft.

To maintain waterproofing, always wash with Nikwax Down Wash Direct®. Do not use detergents.

Drying Instructions

Spin dry multiple times, gradually increasing spin speed. Wet down is heavy – spinning too quickly can damage internal baffles.
Down Proof treated items do not require heat to activate repellency, but tumble drying (if care label allows) is recommended to dry down thoroughly.
Tumble dry on a low setting until clumps have fully disappeared, ensuring there is enough room in the dryer for the item to loft back to size.
Tease apart clumps repeatedly during drying to help restore loft.
After tumble drying, air the item for at least 24 hours in a warm, dry space before packing away.

Nikwax

Nikwax has been the trusted name in waterproofing and aftercare since 1977, creating products that help your outdoor gear perform better and last longer. Their water-based, PFC-free treatments restore and improve the waterproofing of jackets, boots, tents and outdoor equipment, keeping you protected in wet weather without harming the environment.

From easy-to-use sprays for footwear to wash-in solutions for waterproof jackets, Nikwax products are simple, safe and highly effective. They not only refresh water-repellent finishes but also maintain breathability and extend the life of your kit, making them an essential part of any outdoor wardrobe.

Shop Nikwax online at 53 Degrees North with fast delivery across Ireland, or visit us in Carrickmines, Blanchardstown, Cork City Centre or Arnotts Dublin City Centre. For fast and convenient pickup, select Click & Collect at checkout.

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