ILCA 4 MKII sail - HydeNew ILCA 4 MKII Battens are included for free The ILCA 4 MkII uses a more robust 4. 93 oz cloth and adopts a bi radial construction better suited to modern stiffer materials. Additional updates include: A larger sail window Standardized reinforcement patches An updated batten configuration, aligned with the MkII sail family A look and feel closer to the ILCA 7 MkII, improving consistency across the MkII range These changes are intended to improve