The i-Run team says
Technologies
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ActiLite
QuickDry & Wicking; dries quickly and wicks away sweat.
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Smart Skin
Optimized freedom of movement.
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EXO Sensifit
Ease of movement: Better body alignment to facilitate running uphill and downhill as well as on rough terrain.
Endurance: Limits cramps and muscle pain while allowing you to expend less energy and helping to prevent the risk of injury.
Recovery: Speeds up muscle recovery.