... no heat,low power,no harmful rays,etc. safety t shirt has the function of security indication. At night ... . It is of no heat, low power and safety, no X-rays, no ultroviolet light as an ... policeman, soldiery, firemen and any other people who work in dark.colour:various colour.material:Oxford cloth, ... people who work in dark.packing: 1pcs/polybag, 50pcs/CTN/58X38X41CM, NW/GW:11.5/12.5KGS safety t shirt