G'day David,

Coleman hasn't done any R-Value testing on this mat, but we would expect it to have a similar rating to other self-inflating mats in this category.  Based on that the mat should be suitable for winter camping when paired with an appropriate sleeping bag for the conditions.
In terms of size, we generally don't recommend a sleeping mat larger than the floor space of the tent.  It can put stress or pressure on the tent walls and therefore seams over time, and if the mattress is physically up against the tent wall, can create a moisture-wicking point.
You might get away with it if you don't inflate the mattress to its full capacity.

G'day Rick,

Travelling with one of these mats in warmer weather shouldn't be an issue, we'd just recommend ensuring that the valves are open. We wouldn't recommend long-term storage of the mat in the roof top tent if you leave it attached to your vehicle. 

G'day Rick,

The best practice for any stored self-inflating mat is the same - to store unrolled. Non bonded mats absolutely have to be as they will be damaged otherwise.
Mats like the Zempire and Coleman options are fully bonded so there will be no harm to the mat storing them rolled up, but it is recommended if its going to be a long time between trips, to pull them out and inflate them everynow and then.
If you are going camping once a month or so that wouldnt be an issue, but every 6-8 weeks to pull them out would be a good idea.

G'day Pete,

Yes, these mats have a flip-style valve, so you can flip the valve to deflate, push out some air, and then roll up your swag with no worries.

G'day Cheryl,

The Coleman High peak Mats haven't been around long, but so far the reviews are pretty positive, and we're pretty happy with how they look and perform. Overall the Monstamat has a slight edge with the longer warranty period, and as they have been available for longer they've been tried and tested.

G'day Louise,

Unfortunately Coleman hasn't had these mats tested, so there is no assigned R-value. They do have foam insulation, so should provide some insulation, and will be suitable for use in most climates other than in Alpine regions.

G'day Anton,

These mattresses do have foam insulation, however, Coleman has not had these tested so there is no specified R-value listed.

G'day Josh,

Yes, the High Peak Double Camp Mat will do the job. The mattress is a fully sealed unit, so depending on how much you allow the mattress to inflate you should find you'll be supported up off the ground. If you allow the mattress to full inflate, with plenty of tension you'll be fine.

G'day Kalvin,

Coleman hasn't provided any specifications on whether the bag is waterproof or not, but they are seal sealed, and appear to be fairly water resistant. The end that attaches to the inflation valve does have a large hole in it, so it's not completely sealed, but it should do a fairly good job in light showers. If you're likely to hit heavier rain we'd recommend wrapping the mattress in a heavy-duty garbage bag before popping it in the stuff bag, then you'll be set for pretty much anything!

G'day Leah,

The Coleman High Peak Duble and Zempire Twin feel pretty similar to us. They've both got similar designs, and fabrics, with adjustable valves. In terms of comfort, they feel pretty similar to us, so we'd happily recommend either brand.

G'day Keiran,

The intake valve on these is pretty similar to a few other brands we sell. There isn't a specific fitting that will stay in place by itself, but the larger airbed style fitting on all of our 12V, 240V, rechargeable and manual airbed pumps will do the trick, you'd just need to hold it in place while pumping.