These FDX mens quality half sleeve cycling jerseys are a high performance breathable garment, technically designed to regulate body temperature,wick moisture, dry quick, for serious cyclists with a flat seam construction which allows freedom of movement. These are not second skin jerseys and provide a slightly looser, more comfortable fit. 100% Polyester fabric. These jerseys are ideal for summer. Chest Size SMALL: 36" - 37" MEDIUM: 37" - 38" LARGE: 38" - 40" XLARGE: 40" - 42" XXLarge; 42" - 44"