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Hi Keith,
The wide downmat is comfortable, warm and is locked in by the center fabric ridge of the Flex. You have a little leeway in positioning it for a diagonal lie. I had it when I bought my...

Beltwaybandit,

I set up the Flex and shot a couple of photos with the downmat in it. You'll see how the fabric ridge locks the downmat in so that it doesn't shift laterally yet still allows you to...

Beltwaybandit,

I should have added that my Downmat 9 is the wider model. I think it's 26 or
27 inches wide. A 20 inch wide pad or mattress might slide out laterally (or you might roll off to...

This won't be quite the answer to your question but you may find it helpful. I use an Exped Downmat 9 inflated to about 2/3 of max with my Flex. Very warm and doesn't slide out from under me despite...