Hypothermia is a common problem in traumatized patients leading to severe complications such as impaired coagulation, increased rate of wound infections and overall patient discomfort among others. Therefore, the investigators test out the new self warming ReadyHeat® blanket device against the currently used cotton wool blanket in terms of effects on the prevention and treatment of hypothermia.

Hypothermia is a common problem in traumatized patients leading to severe complications such as impaired coagulation, increased rate of wound infections and overall patient discomfort among others. Therefore, the investigators test out the new self warming (via an exothermic reaction) ReadyHeat® blanket device against the currently used cotton wool blanket in terms of effects on the prevention and treatment of hypothermia. Near body core temperature is measured by a sublingual sensor as the "gold standard" of body core temperature measurement - the pulmonary artery catheter - is too invasive and not suited for this collective of patients in the emergency room setting. Blanket use will be randomized. Temperature will be taken at emergency room admission, after 15, 30 and 45 minutes of treatment as well as right before handing the patient over to the next caring unit (ICU, IMC, operating theatre etc.). If treatment time is shorter than expected measurement will stop at the latest possible point. Blankets will be applied to the patient once admission in the emergency room is complete and will only be lifted for interventions.

Inclusion Criteria:

- Trauma patients ≥ 18 years of all severity stages including poly traumatized patients admissioned through the emergency room

Exclusion Criteria:

• Patients < 18 years
• Patients after pre-hospital cardiac arrest or ongoing CPR at time of admission