The Compressport ON/OFF Compression Long Sleeve Shirt has unique interactive fibres which open up and ventilate during effort, and close up and protect when recovering.The revolutionary ON/OFF Interactive Fibres provide optimised ventilation; keeping you always at an optimum temperature while also guaranteeing quick evacuation of moisture and sweat.For optimum comfort, the microfibre body of the ON/OFF Shirt is made from soft, light and seamless microfibre. This provides extreme freedom of movement, breathability and overall makes the shirt ultra light. It also has a V Neck design to prevent chafing or any type of restriction of the neck. It has unique Posture Alignment inbuilt - this light compression area is directly woven into the fabric to: - Ensure you have correct body-positioning during prolonged effort - Ensure your shoulders stay alignedThereby boosts breathing and improves oxygenation during effort as well as after to enhance your recovery. Being Compressport it is also 100% European made and comes with a 2 year warranty.Perfect for all sports especially cycling and running!