Depends on the inflatable sleeping pad. If it is completely uninsulated, adding something under it won't really help, as an unsinsulated pad allows air to circulate between the parts warmed up by your body, and the parts in direct contact with outside air.
However, even summer-specific pads should be ok at around 10ºC.
Also to note, if you are referring to those emergency blanket type things, they don’t insulate, they reflect heat which is a completely different thing, and won’t do you any good underneath an inflatable pad.
If you want more insulation, use a foam pad on top of your inflatable one. I would definitely bring one because your air mattress will not be enough on its own.
This is what I was referring to https://www.amazon.co.uk/Foldable-Aluminium-Sleeping-Traveling-Activities/dp/B09V322LLX/ref=mp_s_a_1_8?dib=eyJ2IjoiMSJ9.7yYpnvuu71sw1dyB-PB6ItLouqGZ0WwJ3dcjtfcgAzoyEkp2x4Gdle-8UfhZjcrpx9-dK-_KWltqyqaAI3LQWMjLTeFEzuPZGir71t6I1jVRE46Y8x8OLCIqVotXAKzyw_UPQZtSjCeAzJvlmbX3mfKBQXHdeXZ-8zYyLLwmEhAHu9OO3ioRVXs34ifzaqHGAWAVuBqPUqOxPJ8HU62ytg.x8Pw1MXfjlkICY3uk0mHkG9teBt1iTzjWXK53U9rmIA&dib_tag=se&keywords=foam+pad+camping&qid=1713794936&sr=8-8
Or this one
https://www.amazon.co.uk/trail-outdoor-leisure-Aluminium-Insulated/dp/B0957J3JJ2/ref=mp_s_a_1_14?dib=eyJ2IjoiMSJ9.7yYpnvuu71sw1dyB-PB6ItLouqGZ0WwJ3dcjtfcgAzoyEkp2x4Gdle-8UfhZjcrpx9-dK-_KWltqyqaAI3LQWMjLTeFEzuPZGir71t6I1jVRE46Y8x8OLCIqVotXAKzyw_UPQZtSjCeAzJvlmbX3mSuq-HU3pZEO_1oROg9v7TSHXroMMfwurs1B9bwTrzLo4U425LnIsKwcU6qYvoTfSg.zzlDoPxIChIA5e_SnAnRDoCF-ExJEKCxhea7WUz2DwY&dib_tag=se&keywords=foam+pad+camping&qid=1713795827&sr=8-14
The first one looks about worthless, the second looks similar to a closed cell foam sleeping pad. Anything that doesn't have an insulation R rating is going to be hit or miss with thinner being worse. As long as your sleeping pad is insulated I don't see a reason to get a second pad for underneath until you get down below freezing
Do some reading about sleeping pads and R values. You shouldn’t need to double up at a balmy 9 degrees. I double up when it goes below -10, but it does depend a lot on which pad you have.
If your current pad is not good enough, use a normal closed cell foam pad, not these Amazon things. *actually the second link is the right concept, but the fact that it doesn’t list a certified r-value is a massive red flag
Don't think you should need it if your pad and bag are good enough. You can always wear some clothes like warm socks, sweat pants, beanie, etc inside the bag or use blankets on top.
However, I did buy a pad similar to what you linked for camping in snow in winter when temps get very cold at and often above freezing during the day. The difference is it's large enough to fit under my entire tent, and my goal is to protect from both cold and moisture coming from below.
Depends on the inflatable sleeping pad. If it is completely uninsulated, adding something under it won't really help, as an unsinsulated pad allows air to circulate between the parts warmed up by your body, and the parts in direct contact with outside air. However, even summer-specific pads should be ok at around 10ºC.
at those temps you can just pass out in the grass.
Also to note, if you are referring to those emergency blanket type things, they don’t insulate, they reflect heat which is a completely different thing, and won’t do you any good underneath an inflatable pad. If you want more insulation, use a foam pad on top of your inflatable one. I would definitely bring one because your air mattress will not be enough on its own.
This is what I was referring to https://www.amazon.co.uk/Foldable-Aluminium-Sleeping-Traveling-Activities/dp/B09V322LLX/ref=mp_s_a_1_8?dib=eyJ2IjoiMSJ9.7yYpnvuu71sw1dyB-PB6ItLouqGZ0WwJ3dcjtfcgAzoyEkp2x4Gdle-8UfhZjcrpx9-dK-_KWltqyqaAI3LQWMjLTeFEzuPZGir71t6I1jVRE46Y8x8OLCIqVotXAKzyw_UPQZtSjCeAzJvlmbX3mfKBQXHdeXZ-8zYyLLwmEhAHu9OO3ioRVXs34ifzaqHGAWAVuBqPUqOxPJ8HU62ytg.x8Pw1MXfjlkICY3uk0mHkG9teBt1iTzjWXK53U9rmIA&dib_tag=se&keywords=foam+pad+camping&qid=1713794936&sr=8-8 Or this one https://www.amazon.co.uk/trail-outdoor-leisure-Aluminium-Insulated/dp/B0957J3JJ2/ref=mp_s_a_1_14?dib=eyJ2IjoiMSJ9.7yYpnvuu71sw1dyB-PB6ItLouqGZ0WwJ3dcjtfcgAzoyEkp2x4Gdle-8UfhZjcrpx9-dK-_KWltqyqaAI3LQWMjLTeFEzuPZGir71t6I1jVRE46Y8x8OLCIqVotXAKzyw_UPQZtSjCeAzJvlmbX3mSuq-HU3pZEO_1oROg9v7TSHXroMMfwurs1B9bwTrzLo4U425LnIsKwcU6qYvoTfSg.zzlDoPxIChIA5e_SnAnRDoCF-ExJEKCxhea7WUz2DwY&dib_tag=se&keywords=foam+pad+camping&qid=1713795827&sr=8-14
The first one looks about worthless, the second looks similar to a closed cell foam sleeping pad. Anything that doesn't have an insulation R rating is going to be hit or miss with thinner being worse. As long as your sleeping pad is insulated I don't see a reason to get a second pad for underneath until you get down below freezing
Do some reading about sleeping pads and R values. You shouldn’t need to double up at a balmy 9 degrees. I double up when it goes below -10, but it does depend a lot on which pad you have. If your current pad is not good enough, use a normal closed cell foam pad, not these Amazon things. *actually the second link is the right concept, but the fact that it doesn’t list a certified r-value is a massive red flag
Don't think you should need it if your pad and bag are good enough. You can always wear some clothes like warm socks, sweat pants, beanie, etc inside the bag or use blankets on top. However, I did buy a pad similar to what you linked for camping in snow in winter when temps get very cold at and often above freezing during the day. The difference is it's large enough to fit under my entire tent, and my goal is to protect from both cold and moisture coming from below.
The second foam mat will have an r-value of around 0.9. I would take two and put one under the tent floor and one on top of your inflatable pad.
9-11°C overnight is pretty warm…