INCLUDED WITH AERIE. NOT NEEDED TO BUY IN ADDITION TO OUR UNDERQUILTS. Easily integrates with the Outdoor Vitals Sleep Systems (Mummypod or Underquilt models). All parts needed to attache your underquilt to the bottom of your hammock Same parts used if using as a pod or peapod design when hanging the underquilt Includes: two 1/8 inch shock cord strands & 4 cord locks