Suitable for an all year base layer use. All year versatility. UltraStretch technology: highly stretchable product designed for top comfort and performance. This product contains 2 recycled plastic bottles. There is no trick, it's called sustainability! UPF 50 certified sun protection against ultraviolet (UV) radiation produced by the sun. Samples of fabrics tested for UV protection in accordance with the international standards. Find the right accessory to combine and achieve the outfit you are searching for. Plenty of styles and colors available.