All packs available are fun and adds a unique beginning to every day. With plenty of pack sizes and silhouettes to choose from you can have a unique underwear everyday! Perfect for potty training, birthdays and holidays - or just everyday! The 7pk and 10pk Toddler Boy briefs and 5pk and 8pk Boys briefs and boxer briefs are 100% combed cotton.The 12 pack makes the ultimate 12-day surprise pack of undies in a box. Perfect for birthdays, countdowns and everyday fun