The next generation of our best-selling skullerz 8945 insert, the 8945fx universal bump cap insert with extra venting delivers enhanced breathability and up to 35% more crown impact protection. This lightweight and breathable impact-resistant shell easily inserts into any baseball cap, hat or other headwear for protection against bumps, scrapes, bruises and other minor head injuries. with flexible sides and convenient trim-to-fit customization, this bump cap insert easily fits a variety of hats/caps and head shapes. The shell is made of lightweight, durable polyethylene with a ribbed top for stronger crown impact protection. All-over venting maximizes airflow for cool comfort, while an interior foam pad reduces impact without absorbing odors for fresh all-day wear. features: next generation bump cap improves upon design of best-selling skullerz 8945 insert for enhanced breathability and up to 35% more crown impact protection lightweight head protection guards against bumps, scrapes, bruises and other minor head injuries enhanced impact protection ribbed top improves top-of-head protection by up to 35% maximum breathability all-over venting enhances airflow to keep wearers cool durable polyethylene impact-resistant insert will not break or crack fits any hat patented trim-to-fit design easily adjusts insert height to fit different cap designs flexible horizontal and vertical two-way flex design for protection that is not stiff or bulky top-of-head padding extra-large closed cell foam reduces impact without absorbing odors weight 75g // 2.6oz patented