100 PERCENT COMBED AND RING-SPUN COTTON, 30 SINGLE 4.2 OUNCE FABRIC. (ATHLETIC HEATHER IS 90 PERCENT COMBED AND RING-SPUN COTTON/10 PERCENT POLY. ALL OTHER HEATHER COLORS ARE 52 PERCENT COMBED AND RING-SPUN COTTON/48 PERCENT POLY. NEON COLORS ARE 52 PERCENT COMBED AND RING-SPUN COTTON/48 PERCENT POLY, 40 SINGLE 3.6 OUNCE FABRIC. TRIBLEND COLORS ARE 50 PERCENT POLY/25 PERCENT COMBED AND RING-SPUN COTTON/25 PERCENT RAYON, 40 SINGLE, 3.8 OUNCE FABRIC.)SIDE-SEAMED. AVAILABLE IN TWO-TONE COLOR OPTIONS. RETAIL FIT. UNISEX SIZING.