Laser 4.7 / ILCA 4 - The smallest of the three rig/sail sizes, the '4.7' Laser sail is used with the 4.7 lower mast section, which is shorter than the 'radial' lower mast section and pre-bent just above the deck line to depower the rig. This sail size is commonly used for youth sailors just getting into the Laser class who are not big enough to manage either the Radial or Standard size rig. Laser 4.7 Sails are ILCA class approved for racing.