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5 Heat Scenarios: Pick the Right Cool Fabric for Hot Weather For casual heat, linen wins on pure breathability, lightweight cotton and lyocell come close at a lower price, and silk or fine merino handle variable temperatures well. For heavy sweating or hard exercise, engineered porous synthetics beat every natural fiber. The real rule: hydrophilic open weaves for passive or humid heat, moisture-wicking synthetics for high-output activity, and a loose, well-ventilated fit for either one. TL;DR: Linen and lightweight open-weave cotton are best for passive cooling, but fiber performance varie …