Steel is the most common material for spring washers due to its ease of process and its high tensile strength. Chrome vandium alloy is a higher quality steel with a good through-hardening capability; it is used to make very thick spring washers.
How to Prevent Swimmerâs Itch. Thereâs no cure-all to eliminate swimmerâs itch. The negative symptoms are, ironically, a problem of our own immune systemâs making, and short of abstaining from swimming altogether, thereâs a risk of getting swimmerâs itch in a Northern Michigan lake.
Don't forget for long swims you need to keep fueling the fire, i.e. eat some carbs or gels. If your body is out of fuel, you won't be able to avoid hypothermia either.   Obviously the closer the water is to 72 degrees the more of your maximum effort you need to put out to maintain warmth. Conversely, the warmer it is the easier you can be on yourself.