Breathing Masks A Color:Gray Compared with the old sealing

Compared with the old sealing strip

The edges are neatly fused

low air resistance design: using advanced airflow optimization technology to ensure large ventilation volume and low air resistance

Once the mattress and frame have been assembled

Breathing Masks A Color:Gray Compared with the old sealingProduct Description Diverse and fun ways to play, 5 endless ways to experience 1. Negative pressure breathing bottle play 2. Breathing bag (3L) play 3. Adjustable flow air port play 4. Visual deprivation play 5. Smell Box. 1. Negative pressure breathing bottle play. Replace the traditional negative pressure bottle with a multi function bottle cap design, even if you go out without a negative pressure bottle, you can still play with negative pressure!