Linen and wool are the two great natural fibres of the warm and cool seasons respectively. Both grow from the earth. Both are fully biodegradable. Both have been worn against the human body for thousands of years. The question is not which is better — it is which is correct for the conditions.

Linen performs in heat. The hollow flax fibre creates continuous ventilation — warmth drawn away from the skin, moisture released, the body staying regulated in temperatures where most fabrics become uncomfortable. Belgian linen, grown in the specific climate of northern Belgium and France, is the finest expression of this quality. In the Gulf, in the Mediterranean, across any warm summer climate, linen is the natural answer.

Wool performs in cold. The crimped, hollow wool fibre traps air in a way no other natural material matches — creating insulation that is responsive to the body’s own temperature rather than fixed. When the body is warm, wool releases. When the body cools, it retains. This is called hygroscopic regulation — the ability of the fibre to absorb and release moisture in response to the humidity of its immediate environment, adjusting passively rather than requiring the body to work against what it is wearing. The full material science is in the wool insulation guide. In cooler climates, in autumn and winter, in the sauna where the head needs protecting from intense dry heat, wool is the natural answer.

The two fabrics are not in competition. They are companions — each excellent in its own season, each doing something the other cannot. At PP, both appear in the collection for exactly this reason. Belgian linen for the shirts, sets, trousers, and tennis collection. Wool felt for the sauna hat, where insulation in heat is the specific requirement.

A wardrobe built from both is a natural wardrobe in the fullest sense — two fibres from the earth, each at its best in the conditions it was grown for.

The linen vs cotton comparison covers the warm-season case in more detail.