





Thermoform Waist FL (Flexible & Lightweight) Harness Size M
Maximum Freedom & Comfort
The Thermoform Waist FL Harness is designed for riders who prioritize lightweight comfort and maximum freedom of movement. Built with lightweight materials, this harness is half a kilo lighter than most other harnesses on the market. Its compact and flexible shape ensures a natural range of motion, while strategically placed molded support and body grip provide stability where needed.
A standout feature is the sliding hook, which includes a spreader-bar stopper for added comfort during cruising. Available in sizes S, M, L, and XL, this harness is perfect for riders seeking a balance of flexibility and lightweight performance.
Key Features:
- Lightweight Materials – Significantly reduces weight without compromising durability.
- Compact & Flexible Design – Maximizes freedom of movement while maintaining support.
- Sliding Hook with Spreader-Bar Stopper – Enhances comfort during cruising.
- Moulded Support & Body Grip – Provides stability where it’s needed most.
Why Choose the Thermoform Waist FL Harness?
The Thermoform Waist FL Harness is ideal for riders who value lightweight construction and unrestricted movement on the water. Its innovative design ensures a snug fit with just the right amount of support, making it a go-to choice for those who demand comfort and flexibility in their gear.
- Harness Construction : Thermoformed
- Hook Height : High
- Back Support : Very High
- Maneuverability : Very High
- Slider Bar : No
Tip: Measure your waist over your wetsuit (if worn) for the most accurate fit.
Unifiber offers versatile windsurfing harnesses tailored to match your sailing style.
- Thermoformed Waist: Perfect for general use.
- Thermoformed Waist SC (Support & Comfort): Ideal for longer sessions.
- Thermoformed Waist FL (Flexible & Light): Lightweight design for greater freedom.
- Standard Waist / Waist with Kite Handle: Classic versatility.
- Freeride Seat: Stability for freeride enthusiasts.
- Race Seat: Performance-driven for competitive sailors.
What does features 1 year unconditional + 1-year conditional warranty cover ?
At Unifiber, we're confident in the quality of our gear and stand behind everything we make.
Here's how our warranty works:
- First year: Your product is completely covered - simple as that. We've got your back so you can focus on enjoying your time on the water.
- Second year: We continue to support you against any manufacturing defects because we believe in building gear that lasts.
- To make things hassle-free, just keep your proof of purchase handy when you need us., we're confident in the quality of our gear and stand behind everything we make.

Expert Advice
FAQs: Choosing the Right Harness
The windsurfing harness is more than just gear—it’s the critical link between your body and the sail, enabling efficient power transfer and control. Choosing the right harness directly affects your performance, comfort, and endurance on the water.
This FAQ helps you find the perfect harness for your style and conditions.
A spreader-bar pad minimizes the risk of equipment damage during contact and adds grip to prevent the waist harness from moving up.
Sliding bars are ideal for windsurfers who want to “dial in” their stance, as they allow hips to turn more comfortably into the sailing direction and reduce harness twisting.
Harnesses vary in back support—the larger the covered area, the more support they provide. Some models include plastic reinforcement plates for added support, while others prioritize flexibility for maximum upper body movement.
Race Seat Harness: Lowest hook height for maximum freedom and body trim.
Freeride Seat Harness: Medium hook height for balanced back support.
Waist Harness: Highest hook height, favored by 70%+ of windsurfers for easier sheeting in/out.
- Thermoformed Harnesses: Made with pre-formed foam that doesn’t absorb water, offering superior non-slip features.
- Classic Harnesses: Lighter and more affordable, made from high-quality polyester materials.
The main difference lies in the spreader bar. Windsurf harnesses have a straight, narrower bar designed to handle higher loads, while kitesurf harnesses feature a more curved, wider spreader bar that spreads out at the ends to accommodate the kite’s control system.

Unifiber Harnesses
Engineered for You
Experience harnesses designed to fit your body seamlessly, offering a lightweight, secure fit that feels like a second skin. Built with advanced technology for optimal support, they ensure long-lasting durability while keeping you comfortable during every sessions.
Learn More