The 821 from the company Zeus is a full face helmet, which protects the entire head and jaw. For this reason, this type of helmet is considered the safest and most durable for both travel and city rides. It is made of thermoplastic, a reinforced hard material of high strength. The helmet has the new European type "ECE 22.06" safety specification certification, which ensures that the helmet is tested at 18 impact control points instead of 6 as before.