Edge loop selections let you select several edges across a polygon mesh without having to select each edge individually. For more information, see Polygon component loops and rings.
To select an edge loop on a polygonal mesh
When you double-click an edge on the mesh, a path of selected edges appears across the mesh in either direction from the edge you select.
For example, if you double-click on a single horizontal edge on a sphere, a loop selection will select the remaining edges that lie along the same line of latitude on the sphere as the edge you selected, provided the selection does not encounter any faces that are not four-sided.
To select a partial edge loop
All the edges between the two edges are selected.