We usually only find out that our sleeping mat isn't warm enough when we're mid-trip, shivering our bits off and wishing we'd got another warm layer to pull on.
Sleeping mat R values have the potential to help us avoid cold, sleepless nights. But these numbers can be misleading, even to the most discerning of campers. Here's everything you need to know about R values and why we don't use them.
R Values are a measurement of thermal resistance – they tell you how well your sleeping mat resists heat loss. The higher the R value, the more your mat resists heat loss and the better it insulates you from the cold ground. As a rule of thumb, an R value of 1.0 to 2.0 is fine for summer use but you’d need a rating of 4.0 to 5.0+ for winter camping.
There's an international standard for R-values. It's an easy peasy lemon squeezy framework to help you make the right decision for the adventure you have in mind. So you can stay warm, sleep soundly and wake up full of beans for your next day out.
Having an internationally agreed standard makes it easier to compare between mats from different companies, much in the same way we now can with EN 13537 Comfort, Limit and Extreme ratings for sleeping bags.
Without a consistent standard, brands will always choose the testing method that produces the highest R value for their mats. These test results can be mis-leading and can make it hard to choose between different manufacturers.
Some types of sleeping mat construction are much more insulating than others. For instance, uninsulated inflatable mats will always be colder than self-inflating mats which are packed with insulating open-cell foam.
Our sleeping mat range covers every eventuality from ultralight inflatable mats for summer backpacking and bikepacking, to luxuriously thick car camping mattresses. We’ve made sure each mat has a particular purpose, influenced by decades of experience using sleeping mats all over the world.
There are lots of different factors that can affect whether you get a warm night’s sleep. Remember that your sleeping mat is only one part of your sleep system, along with your sleeping bag and clothing. That said, choosing a warmer mat means that your entire sleep system will be more effective when it’s time to hit the hay. Well, not hay. Don’t use hay. It gets everywhere.