This cot mattress is upholstered with Natural lambswool. The 500 GSM layer is incredibly soft, breathable and 100% natural. It acts as a very soft comfort layer for little sleepers allowing breathability and temperature regulation.
Wools main benefit is that it is incredibly breathable allowing it to wick away both moisture and increases in temperature when it is placed against say a warmer sleeper. It has the opposite effect when it is cold, of helping to trap warm air and release heat against a colder body.
As wool is a durable material it also lasts for years compared to synthetic fibres which can break down relatively quickly when flattened.