In sustained heat, linen is generally cooler than cotton. The difference is not dramatic in moderate temperatures, but it becomes significant in conditions above 30 degrees Celsius — and in extreme heat, the gap is considerable.

The reason lies in how each fibre handles moisture and airflow differently.

Linen, made from flax, has a structure that promotes airflow through the cloth. The relatively open weave commonly used in linen fabrics allows heat to move away from the body rather than accumulating between fabric and skin. Linen also absorbs a small amount of moisture from the skin and releases it as vapour — so the fabric stays dry against the body even when the wearer is perspiring. The result is a fabric that keeps the body regulated rather than simply covered.

Cotton absorbs moisture well — this is cotton's strength in many contexts. But in sustained heat, cotton reaches a saturation point where it holds that moisture against the skin rather than releasing it. A cotton shirt in 35-degree heat becomes progressively heavier and more uncomfortable as the day continues. A well-made linen shirt in the same conditions performs consistently across the full day.

The practical difference for hot-weather dressing: in a Gulf summer, in the Mediterranean in July, at a beach club, on a yacht — linen remains comfortable through hours of wear. Cotton becomes uncomfortable after the first hour of significant heat.

There are contexts where cotton performs better: in mild, temperate conditions, a fine cotton shirt is excellent. In cold or transitional weather, cotton's moisture retention becomes an asset rather than a liability. Linen is a hot-weather specialist. Cotton is more versatile but has a ceiling in extreme heat that linen does not.

For the Gulf, for the Riviera, for any sustained heat above 30 degrees — linen is the cooler choice.

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