For summer running, the best choices are lightweight technical fabrics like polyester or nylon, with merino wool also appearing as an option for breathable, sweat-managing layers. Cotton is best avoided because it holds moisture and can feel heavy or clammy.
They are, as long as the fabric is breathable and designed to move sweat away from the body so you stay comfortable as the miles add up. A good running top should help you feel cooler, reduce chafing, and not get heavy when you start sweating.
It should sit comfortably without clinging too tightly or hanging so loose that it gets in the way. The best fit gives you free movement through the shoulders and arms while still feeling secure when you run.
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