I purchased this product to assist with running and aerobic exercise. While the band around the waist sits perfectly, the pocket is. not as much. The bag is made out of a material that has a bit of stretch as well as a breathable fabric which is nice because it helps with sweating etc. However for testicular support the bag is too big at the bottom and doesn't hold it in enough Really protect I love everything that goes into this product and if the bag wasn't too big I would have given it full stars.