Skullerz 8944 Universal Bump Cap Insert is made of soft foam and easily inserts into any baseball cap, hat or other headwear for ultra-lightweight and comfortable protection against bumps, scrapes, bruises and other minor head injuries. With flexible foam and convenient, trim-to-fit customization, this bump cap insert comfortably fits a variety of hats/caps and head shapes. Closed cell foam won't absorb moisture or odors for fresh, all-day wear. Interlocking panels securely connect to maintain cap shape. Vented design provides optimal airflow. Bump caps are typically worn in spaces where hard hats aren't required but impact head protection is needed, such as working with low ceilings, beams, low pipes and other bump hazards. It is ideal for mechanics, airline baggage handlers, factory workers and other services that do not require safety, hard hat protection.