WHAT DOES WATERPROOF ACTUALLY MEAN?
To understand Musto’s new waterproof rating standards, we must first understand the technical terms used to explain how a garment can withstand wet climates, what the numbers mean and the engineering behind waterproof construction.
Waterproof fabrics are designed to resist water penetration. Traditionally, this was achieved by applying oils and waxes that repel water. However, modern techniques offer a range of solutions, including thin waterproof membranes, Durable Water Repellent (DWR) coatings, and taped seams. At Musto, we incorporate all these methods, and more, to ensure true waterproof protection.
For a garment to carry the Musto waterproof guarantee, it must feature all three elements:
1. A waterproof membrane
2. A water-repellent coating
3. Fully taped seams
The Membrane
Modern waterproof fabrics use thin membranes with small holes that allow moisture - like sweat - to escape from the inside, whilst preventing water from penetrating from the outside. This design provides both comfort and protection.
The Coating
Durable Water Repellent (DWR) treatments are applied to the fabric’s outer surface to enhance waterproofing and ensure the membrane performs as efficiently as possible.
The Seams
To achieve 100% waterproofness, all seams must be taped. Taped seams are heat-sealed to prevent water from leaking through the stitching.
WATERPROOF OR WATER RESISTANT?
Water resistant products – sometimes referred to as showerproof – are only partially resistant to water. This could be because of the construction of the fabric, or because a light water-repellent coating has been applied to the fabric. Whilst a water-resistant product can resist water droplets to some degree, this will only last for short periods of time.
| WATERPROOF | WATER RESISTANT |
|---|---|
| Suitable for heavier rainfall | Suitable for light showers |
| High water protection | Low water protection |
| Taped seams | No taped seams |
| DWR treated | DWR treated |
| Features waterproof membrane | No waterproof membrane |
UNDERSTANDING THE CONSTRUCTION
The construction of a fabric is just as important to the quality of a waterproof jacket. Waterproof fabrics can be made with 2 or 3 layers and can either be laminated or coated.
2-LAYER
A 2-layer construction typically consists of a fully waterproof outer shell bonded to a waterproof and breathable membrane, with an inner lining that prevents the deterioration of the waterproof layer. This inner lining also acts as a barrier against wear caused by the wearer’s movement and sweat. This is the lightest construction, ideal when low weight or packability is crucial.
2.5-LAYER
Similar to the 2-layer construction, the 2.5-layer design includes an additional lining, coating, or print applied to the inside of the garment. This extra layer acts as a barrier, protecting the breathability of the fabric by preventing dirt or sweat from damaging the inner material.
3-LAYER
A 3-layer construction features an external DWR-treated waterproof fabric layer, a waterproof and breathable membrane, and an additional protective lining. These three layers are bonded together to create a highly efficient fabric that offers comfort, durability, and protection against the elements.
HOW IS WATERPROOFNESS MEASURED AND TESTED?
The Hydrostatic Head rating is a key determining factor in the levels of protection you can expect against open waters.
THE BRITISH STANDARD
Waterproof fabrics are tested using the Hydrostatic Head test to meet the British Standard of at least 1,500mm. At Musto, our garments start at a minimum of 5,000mm, exceeding industry standards to keep customers protected in all weather conditions.
THE HYDROSTATIC HEAD TEST
A Hydrostatic Head test measures a fabric’s waterproof performance by exposing it to increasing water pressure. A sealed tube of water is placed on the fabric, and the pressure is observed until water begins to leak through.
The result, measured in millimetres, indicates the fabric’s waterproof capability. The standardised test ensures reliable protection, allowing customers to stay dry and enjoy outdoor activities in any weather.
A higher hydrostatic head value indicates better waterproofing, making it suitable for more extreme or prolonged exposure to wet conditions.
WHAT IS BREATHABILITY?
Breathability refers to the amount of water vapour that escapes through a fabric. Testing a fabric’s breathability, involves checking how well the fabric allows sweat to escape. Using a method known as Moisture Vapour Transmission Rate (MVTR).
MVTR
MVTR measures how quickly moisture passes through the fabric over a specific time. Higher MVTR values mean the fabric is more breathable, making it more comfortable during physical activities. If a product is waterproof but not breathable, sweat will be unable to escape making the wearer feel ‘damp’ due to perspiration being unable to escape.
USE CASE
Deciding whether a fabric should be more breathable, or more waterproof, will depend on the products end use, where some activities may require a breathability rating to be higher.
INTRODUCING OCEAN TECH™
We believe choosing the right waterproof gear should be simple. That’s why we’ve created OCEAN TECH™, a performance rating system designed to help you easily understand how well your gear will protect you—whether you're facing light showers or the harshest ocean conditions.
First developed in partnership with Gore-Tex, OCEAN TECHNOLOGY™ has been a stamp of approval and a mark of trust for three decades: trust in a product to keep you protected in the world’s most hostile environments.
OCEAN TECH™ is Musto’s own waterproof standard. Our stamp of approval. When we say our garments are waterproof, you can have confidence that our products will keep you protected, no matter the weather, on or off the water.
Our OCEAN TECH™ standard comes in two easy ratings: Ocean Tech™ and Ocean Tech™ Pro. Both are guaranteed to deliver waterproof performance, over and above industry standards, to ensure you stay protected, whatever your activity.
OCEAN TECH™ Pro guarantees that all Musto garments perform above 20,000mm (waterproof rating) and carries a minimum 10,000g/m2/24hrs breathable performance. These garments are built to withstand extreme conditions out on the water.
Musto products in this range include BR3 Sport and BR2.
OCEAN TECH™ guarantees that all Musto garments perform above industry standard. Waterproof from 5,000mm-19,999mm and breathable from 5,000g/m2/24hrs. These garments are built to manage moderate to harsh weather conditions, from day sailing to everyday life on land.
IN CONCLUSION
Understanding waterproofing and breathability isn't just about technical specifications it's about ensuring your comfort, safety, and performance on the water. With Musto's OCEAN TECH™ rating system, you can confidently select gear that matches your specific sailing environment and personal requirements.
Whether you're racing offshore, cruising coastally, or simply looking for reliable protection in everyday conditions, our commitment to excellence remains the same. By investing in Musto's technically superior waterproof gear, you're choosing decades of innovation, rigorous testing, and real-world performance.
Remember that proper care and maintenance will extend the life of your waterproof garments, preserving both their protective qualities and breathability. When your adventures demand the best protection available, trust in Musto's OCEAN TECH™ standard developed by sailors, for sailors, and proven in the world s most challenging conditions.