A4 Sportswear New 2015 Baseball/Softball 1/4 Zip 2-Color Warm-up Jacket Windbreaker. Used by Players from Youth Little League and Travel Ball Players (NB4241 Sizes Youth Small to XL) to High School, Collegiate and Above (N4241 Adult Sizes Small - 3XL). Woven polyester provides lightweight, all-season protection from the elements. Superior moisture wicking characteristics keep athletes dry and comfortable in all weather conditions. Jacket is 100% Woven Polyester, 3 ounces per square yard with 100% Polyester Micro Mesh Contrast Block Inserts, Odor Resistant with Stain Release.