Select the temperature range of sleeping bags

Choose 3 season mummy sleeping bag the most crucial problem is to select an appropriate temperature scale according to the environment and cold-resistant degree.Single mummy sleeping bag generally four different temperature index, indicating the scope of application of the sleeping bags, four temperature scale:
1,comfortable temperature: indicate the maximum temperature of the sleeping bag that can be used.
2, the target temperature: the maximum temperature of sleeping bag, at this temperature you will feel more comfortable, but this temperature refers to different people, there are differences of 10 degrees Fahrenheit.
3, extreme temperatures: the lower limit of the sleeping bag temperature at this temperature, you may feel less comfortable, but wearing warm clothing can safely in the sleeping bag.
4, dangerous temperature: this temperature sleeping bag can pose a threat to human health, should better do not use,if used to wear all the warm clothing.