N-Ferno 6811ZI Rib Knit Hat + Bump Cap Insert, One Size Fits Most, Black Compatible with Skullerz 8945 Universal Bump Cap Insert (included) for protection against bumps, scrapes, bruises and other minor head injuries. Soft dry acrylic with 40-gram 3M flex stretch insulation for warmth and a comfortable fit. Ribbed knit hat comes in one size to fit most. Machine washable (remove bump cap insert before washing). Patented.
