The i-Run team says
Technologies
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Active Fit
The Active fit tops and bottoms are snug and offer great freedom of movement. They are neither too tight nor too loose.
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Aerotech
Microperforated material offering optimal breathability.
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37.5 Cocona Natural Technologies
The 37.5® Technology maintains optimal relative humidity under your clothing to preserve an ideal body temperature, allowing you to perform better for longer. Made from natural components, materials incorporating 37.5® Technology dry five times faster than their counterparts and do not irritate the skin. The active particles do not wash out and do not degrade.