Rare even in the abundant forests of Aerenal, soarwood possesses a magical buoyancy. Ships made from soarwood skim effortlessly over the surface of the water. Soarwood is a necessary component of the airships and elemental galleons manufactured by House Orien and House Cannith.
The speed of a boat or ship made from soarwood is double that of an equivalent boat made from ordinary wood, and the cost is four times normal.
Soarwood has the same physical characteristics as normal wood (hardness 5, 10 hit points per inch of thickness), but weighs only 75% as much.
Source: Eberron Campaign Setting (Page 127)