Butterfly Doors without zippers

The French manufacturer BubbleTree proposes to equip your bubble with Butterfly Doors without zippers:

No wear of zippers. Their intuitive operation makes butterfly doors very functional. They also include a rain protection cap on the exterior side.

Video of the airlock tunnel equipped with a pair of BubbleTree Butterfly Doors – entering the bubble:

Video of the airlock tunnel equipped with a pair of BubbleTree Butterfly Doors – exiting the bubble: