Update- used the Zenbiv system on my Sea to Summit ultralite mat- slept on the tussock tops in Tararua under a tent fly- absolute brilliant. So effin comfortable, being able to roll over at will, with "no" constriction. Was easy as pie unhooking the attachment loops to get in or out. The whole system quilt+hooded sheet+their down topper pillow was so so so comfy. Was maybe 8 to 10 degrees overnight- I could easily kick ma legs to let some hot air(and farts) out and cool air in. Love it.
If anyone has any questions lemme know.
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