You may want to also consider the Nemo Tensor Insulated, the 2022 model has a 4.2 R value. Nemo don't get considered much in the UK but they are quite big in the US. When I was looking for a pad and the usual suspects came up I watched many youtube reviews and many of them prefer the Tensor for over the X-Therm for comfort, low noise, and not having the feeling your going to fall off when your on the edge of it like the others.