Abstract: A double diaphragm check valve for a wetsuit boot comprising a first body disposed on said inside surface being partially inserted through said wall and having an inlet valve seat with a first diaphragm seated therein, a second body having an outlet valve seat being disposed on said outside surface and configured to hermitically connect in series to said first body sandwiching said wall therebetween with a second diaphragm seated therein, a chamber formed in said second body between said inlet valve seat configured to provide clearance for said first elastomeric diaphragm. The present check valve substantially restricts fluid flow to a direction from the inside of the boot to the environment, while preventing backflow. The present invention allows excess water to be expelled from the boot to prevent accumulation of water and the ballooning that results.