Balsa is an exceptionally light hardwood. Laminated vertically together divided by strips of woven flax (also known as linseed), to provide additional torsional and compression strength. Lighter than Poplar/Ash but more expensive.
A traditional manufacturing method that provides strength, durability, good grip and edge hold. Sidewalls protect the sides of the sandwich core, and increase a ski's torsional stiffness and therefore edge control and pop. Added micro-cap increases the durability of the topsheet.