OneSails continues to lead the way in sustainable sail technology, combining performance with environmental responsibility. The company recently rolled out FSI evaluations and received ISO environmental certification—firm steps toward reducing the industry’s carbon footprint without compromising speed or efficiency.

What is FSI—and why should sailors care?

FSI stands for Fluid Structural Interaction, a powerful design tool that merges aerodynamic analysis (CFD) with structural behavior. In simple terms, it shows how sails bend and react under real wind and rig pressure—helping optimize performance down to the stitch.

Why it matters to you:

1. Design optimization for superior aerodynamic flow

2. Structural efficiency—lighter sails, better shape retention

3. Trim insights for smarter rig tuning and sheeting

4. Load analysis to better size hardware and rigging

5. Troubleshooting persistent sail performance issues

FSI has been a secret weapon in the America’s Cup and bridge engineering—and now, it’s in your sailmaker’s toolbox.

4T FORTE and ISO 14040: Real Sustainability

OneSails’ groundbreaking 4T FORTE sail technology now carries ISO 14040 and 14044 certification, confirming a 66% reduction in greenhouse gas emissions over traditional sail production methods.

Recent tests during the Salona 42 Race showed:

• 4T FORTE Main Sail: 57.5% fewer CO₂ emissions

• 4T FORTE Jib: 57.2% fewer CO₂ emissions

The material is also 100% recyclable, making OneSails one of the few truly sustainable options for eco-conscious sailors.

How does this benefit boat owners?

With 4T FORTE sails, owners get race-winning performance, lighter weight, and proven durability—all with a drastically reduced environmental footprint. And when it’s time for new sails, the used 4T FORTE sails can be traded in at any OneSails loft, making upgrades even more accessible.

Whether you’re a racing skipper or a cruising captain, OneSails gives you sustainability without compromise.