Q - PLUS - A: The feature of this model is that it is 2.5 cm long dulled natural gauze on the front. As in the Q6 model, there are tulles that pass air and water from the front to the rear, and there are also fine cut-off poly on the side and back. The feature that distinguishes Q-PLUS-A from Q-PLUS is that there is one layer of belt on the front.