Roller Derby T-Shirt - ...If You Aren't Wearing Panties 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 Official "Get Whipped Clothing" design! Show Off Your Derby Lifestyle with this slightly naughty play on derby ruling! Lightweight, Classic fit, Double-needle sleeve and bottom hem