X-Bionic Mens Energizer Boxer This is the first article of clothing to effectively cool when you sweat and heat when you're cold. X-Bionic's Energizer Boxers are designed to harness the cooling function of the sweat film generated during exercise instead of allowing it to dry up like traditional active undergarments.

At the same time, X-BIONIC Underwear offers effective thermal insulation to prevent overcooling when the sporting activity is finished.