First impression is that the strap is too elastic. It was significantly more stretchy than I expected, but when I tried it out I was impressed by how comfortable it was while still functioning as a belt. Overweight people in particular know the discomfort of sitting even with a belt that is tight enough for work. I've worn this belt for several days now, including two 3 hour car rides and hours of squatting and walking for work. The belt worked very well without the discomfort associated with a traditional belt. I've tried other elastic straps and never found one that was comfortable and worked properly. So far. I bought both this and the 1.5" in case I needed extra support, but the 1.25" worked fine. The clasp is secure and I've never worried about it.