Whether he is building forts, jumping bikes, or heading to baseball practice, have your boy pull on the Columbia Boys" Mini Breaker Sunguard Short-Sleeve Shirt. The soft polyester fabric is dries quickly, stretches so he can move freely, and has a UPF 50 protection factor to help him avoid harmful sunburn. Product FeaturesMaterial: 88% polyester, 12% elastane, Omni-WickFit: Length: Center Back Length: 18 inPockets: Thumbholes: Wash: Antimicrobial Treatment: SPF Rating: UPF Rating: 50Weight: Recommended Use: hiking, camping, sportsManufacturer Warranty: lifetime