Breathable During Summer Wear: the arm sleeves for kids are made of nylon material, seamless and comfortable, breathable and absorbent, bringing your child nice wearing experience, also they can dry fast, proper for a long time wearing without discomfortFabric : 100% Cotton. Protect Skin in Sun - Made of high-quality nylon/spandex, features extreme UPF 50+ protection against harmful rays. Far more effective than sunscreen in protecting your skin. The premium fabrics can block out 99% of harmful ultraviolet to avoid the sunburn, your Kids are maximumly sun protected all day long.Practical Supplies for Kids: the athletic arm sleeves for kids are suitable for most occasions, ideal for both indoor and outdoor, such as cycling, jogging, camping, playing football, baseball, basketball, tennis, playing by the sea and so on, allowing the kids to enjoy the playing time fully.UV Protection : Specially blended Cool Max Fabric deviates the Ultra-Violet Rays and naturally keeps your skin cool. Super Smooth Silky Touch - The stretchy protofilament material assists in blood circulation and enables muscles to recover more quickly after sports or activities. Utilize seamless weaving for comfort, 360 fit and durability. No itchier and leave imprints on your arms.One Size Fits All - These protective sun sleeves are unisex and incredible durability and stretchy to make sure they fit the sizes of the arm of age 3-12. Effective prevention of mosquito bites in outdoors. In the process of special skin rehabilitation, besides resisting sunshine, it can also prevent unconscious scratching.