Blood flow restriction belts and system

A belt for securing to a body segment, the belt comprising:

• an inner belt material;
• an outer belt material, wherein the inner belt material has a higher degree of elasticity than the outer belt material, and wherein the inner belt material and the outer belt material are connected along a perimeter to form a substantially airtight gas bladder for accepting a gas;
• an input port in communication with the gas bladder, wherein the input port comprises a tube heat sealed between the inner belt material and the outer belt material;
• an elastic belt fastening means for fastening the belt around the body segment, wherein the belt fastening means comprises a first fastening means associated with a first end of the belt and a second fastening means associated with a second end of the belt, and the first fastening means is attachable to the second fastening means to limit an initial circumference of the belt when wrapped around the body segment;
• at least one neoprene body interfacing component configured to locate the belt exterior to the body segment by a distance of at least about 1.5 mm and less than about 5 mm prior to inflation of the gas bladder;
• a loop coupler associated with an end of the belt;
• a positive locking means in communication with the first fastening means;
• a positive lock adjustment at a length along the first fastening means;
• and
• a stop mechanism associated with one of the first fastening means or the second fastening means which prevents the associated fastening means from exiting the loop coupler, keeping the belt in a substantially ring-like shape.