This standard specifies performance and safety requirements for wetsuits used in work and leisure activities to protect the wearer's body against the effects of cold water immersion, such as cold shock and hypothermia. One of the requirements of the certification according to the ISO 15027-1 standard is that the body temperature must not drop more than 2°C after one hour in 5°C cold water. In terms of maintaining body temperature, one-piece swimsuits are advantageous because the slowly penetrating water has poor circulation and is heated by body heat, acting as an insulating layer.The Mullion North Sea I provides two hours of protection against hypothermia. The next fishing trip is just around the corner. Every time you ask yourself whether the fishing equipment is still suitable.