And because it fits well, it seals well, which is important... I really feel that protective inhale from the corners of the mask, while still getting a non-restrictive breath. The material feels light... feels as though it’s not even there. Definitely my favorite mask out of the 8 kf94 brands that I’ve bought (of the masks I’ve bought and shared with people, my girlfriend loves the Bluna facefit. A friend loves the BOTN... my brother and his wife love the Kleannara) so it really is just a matter of luck and personal fit. I love the dr puri. Perfect for me.