We ran in (and experimented on) several wool tops and three synthetics to test their performance in above-80 temps.
Testing the absorption capacity, water retention, and drying time of wool, synthetic, and cotton shirts.Wool as strictly a winter layer is an old idea. “‘Wool is warm’ is a 1960s perception,” Dr. Raechel Laing toldLaing is professor emeritus at the University of Otago, where she studies clothing’s effects on thermoregulation and performance during exercise. “You had a big wool jacket or a big wool coat or a wool cardigan or sweater. It was always associated with being warm.
But wool is different now — the fabric and the fibers have evolved. “These fine fibers, twisted tightly, can be knitted into very fine fabric structures that are used in sportswear,” she said. And when wool fabric is thin enough, the attributes that give it its cold-weather superiority—namely its attraction to water vapor and its ability to remain dry after absorbing moisture—are just as beneficial in the heat.
As it turns out, the wool evangelists preaching counterintuitive virtues aren’t crazy: the same fabric bolstering your heavy winter coat is also ideal for summer runs. People seem to be listening now. After decades of being mislabeled and misunderstood, wool, in the form of lightweight merino, is gaining traction as a summerweight performance fabric.Around 80 percent of our heat dissipation while exercising in hot conditions comes not from sweating, but from sweat evaporating from the skin.
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