4.2 oz./yd (US) 7 oz./L yd (CA), 100% airlume combed and ringspun cotton, 32 singles. Ash is 99/1 airlume combed and ringspun cotton/polyester. Athletic Heather & Black Heather are 90/10 airlume combed and ringspun cotton/polyester. Alternate Heather CVC/Blend colors are 52/48 airlume combed and ringspun cotton/polyester. Slim fit. Longer-length body. Shoulder-to-shoulder taping. Side seams. Tear away label. " CLICK HERE for fit comparison with 6400".