As one can see, the introduction of EN 13537 and its successor EN ISO 13537 enables an objective comparison of several sleeping bags, and it is recommended to relate the values obtained to one's own tastes and predispositions. Temperature perception is a very individual matter which depends on age, anatomy, fatigue level, calorie intake and many other factors. For instance, if two women use a sleeping bag with a comfort temperature of 0 in the same conditions, one may get a good sleep, and the other may feel cold. That is why, when choosing a model for oneself, in addition to the manufacturer's stated values, it is also worth considering experience from previous trips and individual predispositions.