Neighborhood bike gangs are going to be jealous of the kid wearing the Troy Lee Designs Skyline Jersey. The cool colors, subtle stripes, and TLD logo give the Skyline a unique look that your little ripper won't want to take off. On the technical side, 100% polyester fabric wicks moisture and dries quickly while offering UV protection. A zip pocket on the back keeps essential items easy to reach and safe. From the pump track to a XC loop with mom, the kids' Skyline Jersey is going to get your little one on the trails with a big smile. Any fabric that’s bluesign approved offers.Coolmax Coolmax fabric features a four-channel fiber design that pulls moisture out and away from the skin, with a larger surface area than other fibers, for faster, more efficient evaporation.High UPF Sun Protection Rating UPF (ultraviolet protection factor) refers to the fraction of UVA and UVB rays that can get through a textile. For example, UPF 15 means that 1/15th (or 6%) of UV rays can get through the fabric. Not all pieces of clothing are equal. Fabric type, construction, color, and chemical treatments are some of the biggest influencing factors. The higher the UPF number, the greater the sun protection, with 50 usually being the highest.