410mm refers to the length of the main body of the sanitary pad. Compared to daily-use pads of 240-290mm and regular night-use pads of around 330mm, this length is significantly extended. It offers greater coverage, conforms to the curve of the buttocks, effectively handles large movements during sleep such as turning over or lying on one's side, reduces the risk of front and back leakage, and eliminates the hassle of frequently getting up to change during the night.