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 5pk and 8pk Boys briefs and boxer briefs are 100% combed cotton. The 4pk and 7pk athletic boxer briefs are made with Coolcraft Technology for Ultra Cool Softness.