Linen is more breathable than many other fabrics because its natural fibres allow air to circulate more easily and release heat instead of trapping it.
It also absorbs moisture well and dries quickly, which helps the fabric feel cooler, fresher and more comfortable during sleep.

Yes, linen is suitable for all seasons.

It feels cool and breathable in warmer weather, while its natural insulating properties also make it comfortable in cooler months. That balance is one of the reasons linen bedding can be used year-round.