ISOFIX top tether strap '' means a webbing strap which extends from the top of an ISOFIX child restraint system to the top tether anchorage , and which is equipped with an adjustment device , a tension-relieving device , and a top tether connector . '' , to read : Figure 1 : Static force application device ( S-FAD ) , isometric views Figure 2 : Static force application device ( S-FAD ) , dimensions