Ultra Stretch technology: highly stretchable product designed for top comfort and performance. 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. This product contains 2 recycled plastic bottle. There is not trick, it\'s called sustainability! Suitable for an all year base layer use. All year versatility. 95% Polyester 5% Elastane Product Code: 120710. 790. 10. 00