Kids size M (10) A versatile performance knit built for use on trails or on the water, it’s quick drying, has stretch for mobility and comfort, plus HeiQ® Pure odor control keeps things fresh. Made of 94% polyester (35% recycled) and 6% spandex jersey with 40+ UPF sun protection, it keeps kids comfortable in conditions ranging from cool to hot. Made in a Fair Trade Certified™ factory.