Recently, we've conducted a few experiments. First, we took two rash guards of the same print color; both navy rash guards, both brand new, and we submerged them in heavily chlorinated water.

Here is what happened; the regular rash guard made of nylon-lycra heavily fades in color, and it starts losing its stretch. 

Conversely, the chlorine-resistant rash guard holds up well in the same conditions. In addition, it is incredibly durable & Long lasting.

See the video documentation of the evidence here.

When it comes to protecting the body from UV rays, a combination of clothing and sunscreen may be the best option for you and the environment.  It is important to note that protecting oneself from the harm that prolonged exposure to UV rays can do.  We also need to know the good that the sun does for us. As noted by healthfully" The sun rays themselves don’t actually contain any vitamin D; instead, skin that is penetrated by specific ultraviolet rays works to synthesize this energy into vitamin D, starting a process involving the liver and kidneys to create the essential hormone calcitriol."

What is UPF? As opposed to SPF which only block UVB(unless listed as a broad spectrum product) , UPF(ultraviolet protection factor) blocks both UVA & UVB.  

Why is that important? With respect to UVA rays, the WHO reports that  "recent studies strongly suggest that it may enhance the development of skin cancers. The mechanisms of this UVA damage are not fully understood, but a popular hypothesis assumes that UVA increases oxidative stress in the cell."

What are we learning today?  We know that years of sunscreen use in an attempt to keep humans guarded from the effects of prolonged UV exposure has had a devastating effect of the environment.  National Geographic reports "When you swim with sunscreen on, chemicals like oxybenzone can seep into the water, where they’re absorbed by corals. These substances contain nanoparticles that can disrupt coral’s reproduction and growth cycles, ultimately leading to bleaching."

There are further effects when traditional sunscreens  end up on the beach and then get washed into the water and off bodies and into drains.