The Skullerz 8943F(x) Universal Bump Cap Insert with flexible hinged wings delivers impact protection and an enhanced fit for larger head sizes and hairstyles. This lightweight, breathable and trimmable impact-resistant insert easily fits into any baseball cap, hat or other headwear for protection against bumps, scrapes, bruises and other minor head injuries. Unlike standard bump caps that have more of a rigid fit, this bump cap is specifically designed to form to and protect varying