The season rating is an 'at-a-glance' indication of the performance that can be expected from a sleeping bag.

A 4 Seasons Rating indicates that a sleeping bag has a high enough specification to be used all year round, while a 1 Season Rating indicates that it will perform best during the summer only.

Ratings in between are intended as a rough guide. For example a 2 Season rating means that a sleeping bag is also likely to be suitable in the chillier nights of the Spring or Autumn.

Refer to the comfort and extreme temperature ratings of each sleeping bag for a more accurate, scientifically tested, assessment.