Flax is a material that "breathes". Besides the fact that it absorbs moisture very well, it also releases it very quickly. This means that it dries very quickly, so it does not stick to the body. Moreover, although flax is a preferred material for summer clothing, it retains coolness in high temperature conditions, and heat in low temperature conditions, as it is a very good thermal insulator.
Linen is an expensive material. It is recognized as a luxury material and often associated with luxury, both due to its undeniable, rare properties, the comfort it offers, but also due to the manufacturing process.