1. Excessive-quality supplies: polymer PC materials, one-time injection molding, excessive influence resistance, corrosion resistance. 2. Elevated face safety: German-style explosion-proof helmet, enlarged masks, retaining an open view. 3. Triangular strap: sturdy development, not appropriate for shaking. 4. Curved cap edge: Enhance the curvature, rubber safety, mushy and elastic, relieve the influence. 5. Three types: a: fundamental fashions; b: edging fashions; c: with masks.