Breathing Sensitive Valve Applicable scenarios: You can experience

Applicable scenarios: You can experience the unique experience of random breathing interruption and start

the oxygen content in the bag decreases from the normal 21% to 15% to 10%

Head circumference within 64CM

This product is for fetish enthusiasts and adult recreational use only

Breathing Sensitive Valve Applicable scenarios: You can experienceProduct Description The air valve can control the amount of air entering by the strength of breathing. Gentle breathing will allow more air to enter, while strong breathing will allow less air to enter. This product can be used with any gas mask with RD40 thread. The air valve is compatible with all gas masks in the store. Product Specifications Material: PLA filaments (100% biodegradable) Color: Black Interface: Compatible with all RD40 threads