Since I have a bit of, shall we say, middle age spread, I thought this rounded belt clip would help keep my Treo 680 securely fastened at my side. Krusell has made another excellent slip for those with slim waists; unfortunately for those of us with middle age spread, it doesn't prevent the occasional slipping from the belt. I AM very impressed with the multidapt concept, so I'm trying other products of Krusell's. Highly recommend the concept.