Nitrox Diver - SCUBA Diving T- Shirt Perfect for PADI Nitrox 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 Unique design by Breathe Divewear with nitrox green and yellow colors like stickers Same color as nitrox diving decals - Nitrox 2 Oxygen Safe Seals Lightweight, Classic fit, Double-needle sleeve and bottom hem