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The Hydration Shirt unlocks your true athletic potential, boosting your hydration by up to 40% and increasing your power output, endurance, and focus – making your body the best version of itself. Numerous exercise studies have shown your body wastes up to 75% of its energy and most of its water just fighting to offload heat. Our cutting-edge, made in the USA baselayer paired with rechargeable phase-change Inserts absorbs this heat at the pulse points before your body wastes so much precious energy and water. Think of the Inserts as radiators for your body, and the Shirt as a high-performance holster. This new, impossibly lightweight system is a revolutionary concept in athletic apparel, but the science is timeless, tried, and true. In fact, it is taught to all First Responders as part of their standard training.