G'day Leonie,

You should be ok with a Regular and a Large Ether Light Mat in your Zeus, however you won't really have any room to spare. Most of the mats are around the same width, with the Large models being a little wider than the Regular. You'll fit, it will just be a bit of a squeeze, unless you wanted to upgrade to a larger tent!

If the size fits, then I can't see any reason why you couldn't use this in a swag, Ian. It would make your swag much more compact for transport.

G'day Zeb,

You'll just need to select the small size mat in the drop-down menu which will update the size. The small mat is 0.470kg, 168L x 55Wcm.

G'day Zeb,

Yes, the Ether Light XT Insulated Mat has the Pillow Lock patches. You'll just need to adhere them to the mat when you receive it.

G'day Daniel,

The Exped Downmat 9LW is a great option, but the Ether Light XT Insulated Large Rectangle is also a great option. As you indicate the Ether Light XT is much lighter than the Exped so you will save yourself a fair amount of weight. In terms of comfort, to me they both feel pretty comfortable, so I guess it depends on what you're used to. The Ether Light XT Insulated Large Rectangular is a newer model so it's possible we only had the tapered models when you trie them out in-store. The Exped has a much higher R-value so it will be suitable for use in snow conditions, while the Ether Light is really designed for Spring/Autumn conditions, and some Aussie winter. Overall we think they're both great options, but the weight and R-value tend to be the tipping factor for most. 

G'day Adam,

The foot end of these mattresses measures 30cm across at the bottom end and about 10cm up the width measures 40cm across. Hope this helps!

G'day Adam,

Thanks so much for your question!
Unfortunately, we don't have a Wilderness Equipment Space 2 on display but based on some quick calculation of all the specs provided the Regular Ether Light XT Insulated would be the way to go. 
The Space 2 head end width is 130cm, the Large Ether Light XT Insulated mats are 64cm wide, so that cutting it too fine in my opinion.
In terms of the tapered mattress fitting inside the tapered tent, my thoughts on this are that Sea to Summit are a very experienced outdoor/adventure gear company, and alot of thought and research goes into their product design.  In my own personal experience using an Ether Light mat I'd say you have nothing to worry about with 2 x regular mats in the Space 2.
Hope that helps.

G'day Kay,

We don't currently have a display model tent to double-check this for you, but I'm fairly confident the large rectangular model will be a little bit too big with the tapered corners on the floor of the atom. We've just sold out of the old model Ether Light XT Insulated Large, so we'll get the new model up online in the next day or so. We're expecting the stock to arrive in the next two weeks.

G'day Thomas,

I've just had a chat with Sea to Summit on the best way to store this mattress. Their recommendations are to not store it in the stuff sack but to store it flat with as few folds as possible, make sure it's dry and aired out, and to keep the valve open.

G'day Joel,

R-Value is the measurement of insulation's ability to resist heat flow. R-Values range from 1.5 upwards and the higher the insulation's R-Value, the better that product is at retaining your body heat. So an R-Value of 8 will do a much better job at keeping you warm than an R-Value of 3.8.

G'day Sim,

The new Ether Light XT Insulated Mats are found to be quieter than the other Sea to Summit air filled mats. They have a slightly different design with larger baffles that not only means they are quieter, they are also lighter for their equivalent thickness.