Long sleeve shirts, long pants and substantial shoes will provide a measure of skin protection. Watches, rings, or other jewelry should not be worn when personnel are working with cryogenic fluids. Lab users should avoid wearing anything capable of trapping or holding a cryogenic fluid in close proximity to the flesh. See the frost bite box for full explanation. Use barrier protection when thawing cryotubes.
Frost bite is a scary concept.
When we think of frost bite, images of mountain climbers come to mind. It is important to think through the process of frost bite. True frost bite due to the long term exposure to extreme cold is particularly damaging. In these cases the freezing time was relatively slow. In extreme frost bite the water in individual cells begins to freeze, beginning with those cells most distal from the central trunk of the body.