Ochroma pyramidale or Ochroma lagopus, commonly known as balsa, is
a common, fast-growing tropical tree, occurring from southern
Mexico to Bolivia, that is noted for its extremely lightweight and
light-colored wood.
Balsa is the lightest and softest timber used commercially. It
exhibits an unusually high degree of buoyancy and provides very
efficient insulation against heat and sound. The wood can be
adapted to a great number of special end-uses where these
properties are essential.