Best For Party Costumes Movie Dress And Larp Costumes. The helmet's outer shell is crafted from mild steel, which provides excellent strength and durability to protect the wearer's head in various situations. Mild steel is a common material used in the construction of protective gear due to its ability to withstand impact and deformation. Inner Leather Liner to enhance comfort and provide a snug fit, the helmet features an inner liner made of high-quality leather. Leather is known for its softness, breathability, and ability to adapt to the wearer's head shape over time, ensuring a comfortable fit.