Foil collars are essential components in modular foil setups, providing a secure connection between the mast and the foil board. Collars are made from either aluminum or carbon fiber. Collars are designed to ensure precise alignment and rigidity in the foil assembly. They help reduce flex and unwanted movement, improving overall performance, especially at higher speeds or under load. Many collars feature integrated hardware and streamlined shapes to minimize drag and simplify assembly.