AGU's MTB helmets are made according to the double in-mold principle. In this process, the hard outer shell is melted together with the EPS inner, reinforcing the helmet at crucial points, making it extra safe and sturdy, while still being lightweight. AGU's MTB helmets have two types of adjustment systems. Both systems allow you to adjust to the proper head size easily. With both the Detox sliding system and the Direct-dial system, the inner ring is adjusted easily to the proper head size. And the Keylock system allows you to "lock" the strap lengths simply. The MTB helmets have a removable visor that protects your eyes and face from sunlight, rain and splashing mud. All helmets fit perfectly, are low in weight, have sufficient ventilation openings and are extremely comfortable.