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Under Armour Base layers

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Find Clothing from Under armour for running and triathlon

Engineer Your Performance for Running and Triathlon

Under Armour was born from a simple need: to create a superior T-shirt that worked with an athlete´s body to regulate temperature and enhance performance. This foundational principle has evolved into a global mission to make all athletes better through passion, design, and the relentless pursuit of innovation. For the dedicated runner and the determined triathlete, this translates into a comprehensive ecosystem of gear designed to help you push boundaries, shatter personal bests, and conquer every mile of your journey. At runnerinn, we are proud to present a curated collection of Under Armour apparel that embodies this spirit of relentless improvement.

The absolute core of any successful running or triathlon kit is the base layer, and this is where Under Armour’s technological prowess truly shines. Your base layer is not just another piece of clothing; it is your second skin, the engine room of your performance system, and the first line of defence against the elements and fatigue. Under Armour has perfected this essential garment, creating a range that addresses the specific needs of endurance athletes in any condition.

For training and racing in the heat, the iconic Under Armour HeatGear® collection is indispensable. These base layers are engineered with an ultra-light, highly breathable fabric that acts as a personal cooling system. The advanced moisture-wicking technology pulls sweat away from your skin to the fabric´s surface, where it evaporates rapidly. This keeps you significantly cooler, drier, and lighter on your feet. The compression fit options within the HeatGear line provide a locked-in feel, supporting key muscle groups to reduce vibration and fight off fatigue during long-distance runs or the final leg of a triathlon. By preventing chafing and managing heat, these base layers allow you to stay focused purely on your pace and form.

When the seasons change and the temperature drops, your training doesn´t stop. The Under Armour ColdGear® series is your armour against the cold. Featuring a dual-layer fabric with a brushed interior, these base layers trap your body heat to provide exceptional warmth without the weight or bulk of traditional winter gear. Crucially, the material continues to wick sweat, preventing the dangerous chill that can occur when moisture cools against your skin. This intelligent temperature regulation means you can tackle those crisp morning runs and winter training blocks with confidence and comfort, maintaining optimal muscle temperature for peak performance and injury prevention.

Beyond the foundation, the Under Armour philosophy extends to a full range of running and triathlon apparel. Discover lightweight, aerodynamic shorts and singlets that offer complete freedom of movement, and technical tops that provide unparalleled ventilation. Complement your kit with Under Armour’s innovative running shoes, featuring technologies like HOVR™ cushioning that gives back the energy you put in.

Under Armour understands the mindset of the endurance athlete. It’s about the discipline, the sacrifice, and the unwavering will to succeed. Every stitch, every fabric, and every design is a reflection of that commitment. Explore the Under Armour collection at runnerinn and build your ultimate performance system, starting with the most critical piece: the base layer. Equip yourself with the technological advantage to run further, race faster, and achieve more