Previous studies have shown that comfort and convenience problems are a major factor associated with the non-use of safety belts. One of the most frequent criticisms cited is the poor fit of the shoulder belt. A solution to this fit problem was developed such that if shoulder belts were designed to fall within a specified "comfort zone", then the fit of this belt should be acceptable to 80 percent of the adult population. Because there was some concern that this comfort zone might compromise the crash protective capability of the belt system, a number of sled crash tests were conducted using various belt geometries and different sized dummies. The results indicated that designing shoulder belts to fall within the comfort zone would not compromise crash protective performance in frontal crashes.