ohm symbol T Shirt 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 This ohm symbol TShirt is a great birthday gift idea, christmas gift or any other gift giving occasion The ohm symbol T-Shirt is great for yoga, new age, spiritual lover Lightweight, Classic fit, Double-needle sleeve and bottom hem