We use every day casually because it is super lightweight design *! Jugal bone fitting curve and cheeks fitting curve fit face. *Normal size comparison for adult in super niceness 1.Natural collar which is usable in all seasons! 2.Super lightweight design *! Is lightest super comfortable history; is light; arrive; feeling. 3.Lips solid space! There are few feelings of pressure in space of lips, and breath is easy. * Normal size comparison for adult in super niceness 4.Double fitting curve structure! There are few gaps with curve structure along face. 5.We block in "99% cutoff filter (R) ※" well! It is hard to come to have a pain in ear for "slim and straw or ear" of 6.6mm width! ※ The sampling efficiency test mean (virus spray: VFE examination) of filter part ・Super lightweight design * ・Virus spray 99% cutoff filter ®※ ・We are reliable in PM2.5 * Normal size comparison for adult in super niceness ※ The sampling efficiency test mean (virus spray: VFE examination) of filter part ◆Mask does not completely prevent infection (invasion).