One thing to be mindful of is that you do not want too loose of a fit either.

I was using a gathered-end underquilt protector one night when I set up on a ridge(for the view the next morning). Well, winds came right up from the valley under my tarp, and my underquilt protector acted like a big billows. As it was flapping in the wind it was 'pumping' cold air INTO my underquilt. I finally realized what was happening, got up, and attached a shock cord over the top of my hammock ridgeline and it fixed the issue.

Lessons learned:
1) don't set up on a ridge
2) don't have too much gap between UQ and UQP

I have since switched to the Warbonnet UQP but also have not been in a similar circumstance, so no real world test if it will perform better in high winds or not.

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