Mesh side panels Angles cuffs and low-profile thumb holes Anti-odour technology Hex-shaped pattern This half-zip top from Under Armour's ColdGear Reactor range keeps you warm when training in cold weather, ideal for winter runs. The unique hex-shaped pattern traps warmth but still breaths to keep you feeling fresh, mesh side patterns can also be found for ventilation. The fabric stretches in 4 directions to ensure your motion remains unhindered and the fabric features anti-odour technology to prevent the spread of microbes.