How our sleeping bags are tested
The Alpkit Sleep Limit is a single figure based on the combined experience of us, our customers and our Alpkiteers spending many nights out, all year round, in all conditions and is backed up by thermal testing and years of expertise with fill, materials and construction methods.
Our sleeping bags are tested using the Leeds Comfort Model in the labs at Leeds University. The results of these tests are interpolated to give an equivalent EN13537 rating so that you can easily compare our sleeping bags with other brands.
The Leeds Comfort Model
The tests are performed according to BS 4745:1990 utilising a single plate togmeter with a 50 cm diameter. Sleeping bags are allowed to loft for a minimum of 4 hours prior to testing and the temperatures are measured in a central location where the chest bone of a sleeper would be.
EN 13573 values are provided for comparison and are based on a calculation derived from comparative tests on identical sleeping bags.
|Season||Night temperature||Required thermal insulation (Togs)|
|Summer||15 to 18||3 to 5|
|Spring / Autumn||10 to 0||5 to 8|
|Winter||3 to -10||7 to 10|
|Mountain||-5 to -20||9 to 12|
|Polar / High mountain||-15 to -40||11 to 20+|
As far as thermal testing is important, it is just one tool we use to recommend the suitability of our sleeping bags for any given condition. This is why our recommended Alpkit Sleep Limit can differ from results recorded under laboratory conditions.
Similarly tagged stickies: Alpkit’s ethical down policy [pre-winter 2016], Brukit Jackal and Brukit Wolf, Bruler, Can I zip together long and short sleeping bags?, Chilkoot softshell trousers, Clip, Cloud Cover, Dishwasher Safe - Can I put my cookware in a dishwasher?, Filoment Hoody, Gamma - How to change the battery pack?, Head Torch Functions - how to turn on the sidelights or change light colours on your Alpkit torch?, How breathable is the Hunka bivi bag?, How do I clean my down jacket?, How do I prevent condensation in my tent?, How to clean your down sleeping bag, How to pack a Double Dozer, How to roll up a dry bag, Jaran tent pitching instructions, Lampray, Left or right zip, Ordos tent pitching instructions, Packing your sleeping bag in an Airlok, Phantac hydrophobic RDS jacket, Prism battery lock - How to save my batteries?, Self inflating camping mats - Alternative repair techniques, Self inflating camping mats - Find your puncture 2, Self inflating camping mats - Locating a puncture, Self inflating camping mats - Repairs, Self inflating camping mats - Repairs and care, Self inflating camping mats - Using in winter, Self Inflating Sleeping Mat Instructions - First use and care guide, SLEEP - optimising your sleeping bag’s warmth, Sleeping bag comfort ratings, Sleeping Mats and R values, Storing Gas in your BruKit, Where does it come from? Alpkit gear sourcing, Which sleeping bag is suitable for my Kilimanjaro trip?, You Warm the Bag,
Didn't find the product you were looking for or can't remember it's name? Try searching again or clicking on a category.
Download instructions for your product
Living with your Alpkit goodies and looking after them.
All about shopping at Alpkit
- Accident replacement scheme
- Kilimanjaro Kit List: What to pack
- Alpkit Finance Options
- Keeping up with the exchange rate fluctuations
- Where does it come from? Alpkit gear sourcing
- Can I swap a product in a bundle?
- SagePay US State Abbreviations and US State Postal Codes
- PayPal Payments
- Club or Group Discounts
- Website Problems
- Placing an order
- Shipping Options
- 123 Day Returns