Temperature Ratings & Sizing

Wiggy's Temperature Ratings & Sizing

Wiggy Sleeping Bags are rated on a ground pad and in a shelter. We do not advise the use of cots, air mattresses or any suspension from the ground. When the user allow air flow under them, they will have to heat the air of the shelter in order to reach the temperature ratings of the sleeping bags. We suggest a proven ground pad to be used with all of our sleeping bags.


Temperature ratings are estimates, not guarantees. Real-world warmth varies from person to person and night to night. Humidity, wind, your sleeping pad, clothing, food, hydration, altitude, and shelter all make a difference. Choose a bag rated colder than the lowest temperature you realistically expect, test new gear close to home first, and always carry emergency equipment. Read the full safety notice.

Choosing the Correct Temperature Rating

We suggest that new customers call us to discuss their particular needs and situations. If this cannot be achieved, please remember a few things to take into account:

  • Age...
  • Physical Condition...
  • Gender...
  • Destination...
  • Altitude...
  • Shelter Type...

all play a role in the proper bag choice. Please remember that the lighter the bag, the less insulation.

Sizing Info

We stress that:

  • A correctly chosen temperature rating...
  • A properly fit bag...
  • Used in the proper conditions...

will give the user a warm and comfortable night's sleep, far superior to the nights you may be used to out of doors.

Ordering the Proper Size Sleeping Bag

This applies to Mummy style sleeping bags as well as the Nautilus & Desert model bags.

The Nautilus and Desert bags are +40° bags. The Desert bag is for people who are 5 feet 9 inches or smaller and weigh 150 pounds or less. The Nautilus bag is for people larger than who would use a Desert bag.

The Overbag, Ultra Light, Super light and Ultima Thule bags come in four standard sizes. They are as follows.

  • Regular length/regular width will fit 5 feet 9 inches and a weight of 150 pounds. The bag size is 80 inches long and 31 inches wide.
  • Regular length/wide bag will fit a person 5 feet 9 inches and over 150 pounds, up to about 235 pounds. The bag length is 80 inches and the width is 34 inches.
  • Long length/regular width will fit a person who is 6 feet 5 inches and no more than 170 pounds. The length is 90 inches and the width is 31 inches. ( it has been our experience that tall people prefer the long and wide bag)
  • Long length/wide bag will fit a person 6 foot 5 inches and 260 pounds. The length is 90 inches and the wide is 34 inches.

As a rule when ordering the Ultima Thule, I recommend the wider size since there is double the insulation on the top half of the bag which does reduce the interior of the bag slightly. Also note: the Antarctic bag is made in both lengths, but the wide width only since there is double insulation top and bottom.