Ham Radio T-Shirt Operators Do It With Greater Frequency Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Funny t-shirt for ham radio operators and hobbyists. Great gift for handheld radio technicians. Extra humorous! Lightweight, Classic fit, Double-needle sleeve and bottom hem