These cotton biking panties feature a cute star mesh fabric on the back and provide full back coverage for any range of activity. They come with a soft, cotton gusset lining for maximum comfort. Available in a value pack bundle of assorted colors. General sizing guide corresponding to US pants size: Small (0-2), Medium (4-6), Large (8-10), X-Large (12-14). Made of 92% Cotton and 8% Spandex. Machine wash in lingerie laundry bag, line dry. For better results, hand wash.