Designing motorcycle helmets yourself requires a good understanding of helmet safety standards and materials. Start by researching helmet design principles and safety requirements. Next, create a detailed design plan including helmet shape, padding, ventilation, and visor features. Finally, consider consulting with a professional helmet designer or engineer to ensure your design meets safety standards and can be effectively produced. **

Old brass helmets and steel helmets of the fire department or the military are protective headgear worn by firefighters and military personnel. The old brass helmets are traditional headgear worn by firefighters and are often used for ceremonial purposes. Steel helmets of the fire department or the military are modern protective headgear designed to provide impact and fire protection in hazardous environments. Both types of helmets are essential for the safety and protection of those who serve in these professions. **

Full-face helmets provide more protection for the face and jaw in the event of a crash, making them better for more aggressive and high-speed cycling such as downhill mountain biking or BMX racing. However, for general cycling, half-shell helmets are often preferred due to their lighter weight, better ventilation, and less restrictive feel. The choice between the two depends on the type of cycling and the level of risk involved. **

Medieval helmets were protective headgear worn by knights and soldiers during the Middle Ages. They were typically made of metal, such as iron or steel, and designed to cover and protect the head, face, and neck. Different styles of helmets were used depending on the time period and region, with variations in shape, size, and decoration. Helmets played a crucial role in providing protection in battle, as well as symbolizing the status and identity of the wearer. **

MTR helmets are a type of protective headgear designed for use in mountain biking and other extreme sports. They are specifically engineered to provide maximum protection for the rider's head in case of falls or collisions. MTR helmets typically feature a durable outer shell, impact-absorbing foam liner, and adjustable straps for a secure fit. These helmets are essential for ensuring the safety of riders while engaging in high-risk activities. **

Epilepsy helmets are specialized headgear designed to protect individuals with epilepsy from head injuries during seizures. These helmets are equipped with sensors that can detect abnormal movements associated with seizures and trigger protective measures, such as padding or cushioning, to prevent head trauma. They are often used by individuals who are at high risk of falling and injuring themselves during seizures, providing an added layer of safety and peace of mind for both the individual and their caregivers. **

Full-face helmets designed for extreme sports are not recommended for use as motorcycle helmets. While they may offer some level of protection, they are not specifically designed to meet the safety standards required for motorcycle helmets. Motorcycle helmets are designed to provide protection against high-speed impacts and are tested to meet specific safety standards, which may not be the case for extreme sports helmets. It is important to use a helmet that is specifically designed and certified for motorcycle use to ensure maximum protection while riding. **

Firefighter helmets have a similar design to those of Wehrmacht soldiers because they both prioritize functionality and safety. The shape of the helmet provides protection to the head and neck, while the material used is durable and heat-resistant. Additionally, the design allows for easy identification of firefighters in emergency situations. While the appearance may be reminiscent of military helmets, the primary focus is on ensuring the safety and effectiveness of firefighters in their line of duty. **