In a domestic situation, such as a centrally heated house, a system called the TOG rating is used. As this is a stable environment, we cannot realistically use this form of measurement for Sleeping Bags – there are too many external factors, which will affect the performance when outdoors. Factors such as:
As a guide we use “Season Ratings“
These ratings are based on the UK only!
Roll Mats and Airbeds.
Sleeping Bags will lose a huge amount of insulation through cold ground. This is mainly due to the weight of the body crushing the synthetic, or natural, filling and consequently being unable to loft.
A simple Roll-Mat will help to combat the loss of insulation. Roll-Mats come in a variety of thickness, and degrees of warmth. Some ar even foil-coated, which is deisgned to reflect lost body heat. Roll-Mats are very lightweight, and can be easily fastened to a rucksack. They are not, however, designed for “mattress comfort“.
Airbeds, however, will offer a fair degree of comfort, but are very heavy and are not recommended for backpacking.
- the time of year
- weather conditions
- use of a rol-mat/airbed
- individual body metabolism
- altitude
- Season June- Aug (Summer)
- Season April – Sept (Spring/Summer)
- Season March – Nov (Spring/Autumn)
- Season Jan – Dec (Year round use)
- Season Jan – Dec (Altitude)
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