Balaclavas are primarily used to protect against splashes and dust during experiments. They are commonly made of non-woven fabric or polyethylene, and are breathable and disposable. Helmets are essential personal protective equipment, mainly used to protect the head. Common types include safety helmets, riot helmets, and fire helmets. They are mostly made of ABS engineering plastics or high-strength composite materials, offering impact resistance and puncture resistance. Helmets typically feature adjustable linings and comfortable, breathable designs; some professional models also integrate communication devices or night vision equipment supports.