Summer gym sessions

I’ve got my initial steel cage from Amazon. A Holy Trainer is arriving next week so far, I’ve managed to keep the device discreet while at the gym by wearing loose athletic pants and sweatpants. However, summer is approaching and shorts will become part of my routine. So my question is: which cage works best under gym shorts? Or should I just unlock it for that hour?

It likely isn't a problem unless your shorts are quite snug. A cage featuring an integral lock or security screw (such as the Mature Metal Queens Keep I am currently wearing) is simpler to hide because you avoid the usually visible square padlock. If I need absolute confidence that nothing stands out, such as when visiting the chiropractor, I layer tight swim trunks over my underwear but underneath my pants or shorts.