what do y’all use a wrap or just the ring?

In many of the photos it looks like it's the outer skin that's being stretched instead of the inner body. Is this what I'm seeing or not?

So what's the best warm up method. I am interested in infrared heating pad. I found one by Total man! So what's the best way to warm up the penis before any penis exercise. Stillonsystems, Bathmate pump, or Ez-jelq for jelqing . Is it taking a shower each time before exercise? Using a hot rag and wrapping the penis Or using the infrared heat pads with red light therapy! For warm up methods.