The Side rail is made of nylon new material, high strength and durability, the special screws and nuts are made of steel electroplating anti-rust treatment, strong and durable and the suspension match is high, the elastic hook is made of new material latex elastic rope, the hook is made of steel electroplating anti-rust treatment, the hook and the elastic rope are connected by the United States UL certified heat shrink tube heat shrink protection link.The VAS Shroud is made of aluminum alloy metal material, and the special screws and nuts are treated with steel rust prevention. The inner pad is composed of 6 EPP foam polypropylene back pasted high quality wool Velcro and memory sponge. The EPP pad has high toughness and good softness and is not easy to break. The memory cotton can be deformable according to the head shape and slow pressure to make wearing more comfortable. The inner pad is composed of 6 EPP foam polypropylene back pasted high quality wool Velcro and memory sponge. The EPP pad has high toughness and good softness and is not easy to break. The memory cotton can be deformable according to the head shape and slow pressure to make wearing more comfortable.The adjusting belt of the head hoop is made of polyamide material with strong tensile strength, the hanging belt is made of high-quality polyester webbed tape, the adjusting buckle is made of polyamide material, the external screws and internal metal parts of the regulator are made of 304 stainless steel, the front buckle is made of aluminum child buckle, which will not oxidize and rust after long-term use, and the adjusting knob is made of rubber. Excellent strength and feel, jaw strap fastener is also made of poly formaldehyde material with high strength and good flexibility, which is not easy to break after several times of wearing. Leather jaw strap is sewn with high-quality suede leather, which is comfortable and durable to wear. The front and rear contact head of the suspension are made of 3mm black high-foam cotton with black encrypted velvet super fiber cloth. The left and right contact head materials are made of black encrypted velvet super fiber cloth.