Great to wear under compression shorts and leggings
Rear straps on jockstraps are usually intended to keep the front pouch in place. "Strapless" jockstraps usually make up for it by having a very elastic region beneath the pouch that "latches" beneath the scrotum to stay in place. This does a good job of it, however the material is a bit harsh under the scrotum and could probably be a bit stretchier. I think they're great for compression shorts and leggings, because the tight spandex will further secure the goods in the support pouch.