1polyester fiberHigh Quality FabricIce silk fabric, soft touch, silky and cool. High elastic fabric, with comfortable.2Excellent Workmanship CraftsmanshipMesh stitching, perspiration and ventilation, ergonomic tailoring, comfortable to wear, elastic mesh more breathable.3Prevent Slipping Upgrade ExperienceLycra ice silk fabric, not hand, but also can modify the arm line. Upgrade and widen the anti slip belt. It fits the arm without running, and it is not easy to fall off when running or riding.4Advanced FeaturesEffectively block ultraviolet rays and protect skin. A sudden drop in temperature can be seen on the ice.5Size Lifetime Guaranteeour sleeves are not normal size, but m, l and XL sizes. Our customers are very happy to be able to buy such amazing products at affordable prices. They are well worth wearing because they look cool, of good quality and durable. If you dont love them after you buy them, we promise a 100% refund.