保护头盔 meaning in English

bone dome
bonedome
crash helmet

Specification for protective headgear used in skateboarding
溜冰板用的保护头盔标准规范
Specification for headgear used for soccer
英式足球用保护头盔标准规范
Impact protection helmets for young children
儿童用冲击保护头盔
Standard specifications for helmets used in skateboarding and trick roller skating
溜冰板和滚轴溜冰用的保护头盔标准规范
A lightweight protective helmet , usually of metal or reinforced plastic , worn by workers in industrial settings
安全帽一种工人们在工业生产环境中戴的通常用金属或加强塑料制成的轻型保护头盔