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Sleeping Kit for Wayfarers
The basics for sleeping are: a mat to lie on, and an insulative layer to sleep in/under. You can also add a liner and a pillow.
Sleep Mat
A mat keeps you from the cold hard ground. Sleep on the earth saps bodyheat very quickly, and is incredible uncomfortable. If you have nothing else, ferns or bracken piled up, or cardboard from a skip, are preferable to lying directly on the ground.
However, the best bet is to carry a portable mattress. This can be closed-cell foam, which is indestructible, waterproof and cheap, but bulky and less comfortable. Or you can use an inflatable mat, which is more expensive and prone to failure, but much more comfy.
Some people only use 3/4 length mats, which helps reduce weight. They might put their lower legs on top of their backpack, which often already contains a layer of foam insulation. I find this a bit much though…
This leads to the question of how long is long enough, and how wide is wide enough? This will depend largely on your body size. Check the dimensions of all mats before you buy. Would you like your head and feet on the mat? Or are you willing to have your head off the end? If you use a pillow, this may be ok. Much also depends on how you sleep. Side sleepers often prefer a thicker mat, as hips exert focused anatomical pressure, which can result in touching the ground in thinner mats, which is not comfortable.
It may be that the ‘best of both worlds’ is a good option - buying a 3-season inflatable mat, as well as a foam mat. In deep winter, combining the two will be more than adequate, for far less money than a specialist winter mat.
One other option is to carry a sheepskin. These have an R-rating of approx 3, and can be a wonderfully tactile and comforting addition to your kit, especially if you dislike plastic, which all camping mats otherwise are. You can buy organic English sheepskins here. But they are heavy, and not as waterproof as foam, unless you wax the base. Also, they are bulky - but sometimes, the right bulk feels good to carry…
I have listed a bunch of foam and inflatable mats below, at various price-points. It is worth noting that there are MANY other manufacturers available. Perhaps the most worthy of note, in terms of value for UK camping gear, is Alpkit, who have many decent mats at good prices.
Foam Mats
This mat is good for year round use, from winter to summer, and is made in Britain.