The Polartec® Power Stretch fabric used to make the Santini Delta Berg jersey features four-way stretch technology that ensures a perfect fit, strength and abrasion resistance. As a result, the jersey is able to quickly wick away moisture and maintain its shape even after prolonged wear. The back panel is made from Polartec®'s eco-friendly Delta fabric, which contains 50% recycled P.E.T. This fabric provides fast wicking of sweat away from the body, ensuring quick drying and optimal breathability. The jersey has a slim fit with thicker sleeves that fit close to the muscles without restricting movement.