For the ultimate in hammock restraints, this hammock has 7 D-ring attachments and a neck collar with metal buckle fastenings adjustable up to a 17 inch circumference neck. With their neck secured into this hammock, your sub will be severely restricted. It measures 44 x 140 cm (17.25 x 43 inches). This hammock is also incredibly easy to store after each use. Roll in up and put it back into the bag it came in. NB. The metal chains (pictured) are not included.