ION Radium Waist Windsurf Harness

The ION Radium is the ultimate choice for windsurfers who demand top-tier performance and comfort. 

Now featuring the brand-new Spectre Bar 2, it provides exceptional load distribution and flexibility, ensuring superior control and responsiveness during high-performance sessions. Built with a hybrid shell construction, the Radium combines rigid hardshell elements with soft materials, offering the perfect blend of support and freedom of movement. Chosen by professional windsurfers like Victor Fernandez, the Radium is the most popular harness in ION's windsurfing range, delivering pro-level precision and comfort for the most demanding riders. The soft neopren belt and light PVC buckles enable you to find the perfect fit. Whether you’re pushing your limits or seeking premium performance, the Radium is engineered for the ultimate windsurfing experience.

Video

ION Spectre Bar 2.0 Video

Key Features

Hybrid shell construction: Partly molded Curv composite material with strong back support and flexible sideparts.
Ergo_Pad: The exchangeable Ergo_Pad on the harness inside offers optimal lumbar support in two profiles (medium and high support). For individual back support & injury prevention.
Spectre Bar 2: ION‘s latest innovation in spreader bar technology. Incredible flexibility and a slim outline.
Ultra lightweight: Thanks to its light construction combined with a clever mix of materials, this harness ranks as the most durable and lightweight hard shell on the market.

Features

Spectre flaps: Easily removable and attachable, crafted from durable TPE plastic to prevent the spreader bar from twisting upward. These flaps provide additional stability and enhance responsiveness, ensuring optimal performance during your sessions.
PVC Buckle: Standard PVC buckles for easy adjustments.
HD_Foam: Elastic foam for a comfortable fit without soaking up water.
Internal Flex_Belt: A flexible closing belt system on the inside guarantees a snug fit and adapts perfectly to the rider’s individual anatomy.

Materials

30% Ethylenvinylacetat 25% Neopren 20% Polyvinylchlorid Foam 10% Polyester 10% Nylon 5% Polypropylen

Item Number

48252-4742

YOUR FREE ION HARNESS MEASUREMENT SET

This is a paper measurement device to help you work out which size harness you are, including if you are a standard or tall version.

When it comes to your harness, everyone should care about having their individualised fit. Find your perfect individual fit with ION's 3D Fit Technology for all hard shell kite & windsurf harnesses. It keeps you riding longer, protects your back for the years to come and gives you extra confidence on the water.

ORDER YOUR FREE ION HARNESS MEASUREMENT SET NOW

If you are still unsure on the right size for your ION harness, please come in-store for a free ION harness fitting.

🚚 Shipping Info (UK)

We offer FREE UK shipping on orders over £50. For orders under £50, a small £4.75 shipping fee applies.

• Smaller items ship via Royal Mail First Class
• Larger or bulkier items go via courier (usually next working day)

We aim to pick and pack orders within one working day. Some larger items may take up to two days to prepare, especially if they require custom packaging or boxing.

📦 Check the stock location shown near the “Add to Cart” button.

Being the UK's Duotone / Fanatic / ION Specalist store we are proud to be the only UK retailer with a live stock feed from their warehouse — so you can shop with real-time confidence.

• In-store stock typically ships within 1–2 working days.
• Our shop is normally closed on Tuesdays and Wednesdays, but during busy summer months we may process orders more frequently.
• Warehouse stock can take 5–10 working days to arrive before dispatch.
• Large items from the supplier are often drop-shipped directly to your door, with tracking uploaded once available.

🛡️ For high-value orders (e.g. complete setups or large kits worth thousands), we include a discreet tracking device inside the parcel and provide a free returns label for added peace of mind. We take extra care with these deliveries to make sure everything arrives safely.