Why not a tarp close to the hammock--because for the over cover to hold in heat (and I don't think 10F is insignificant at all) it needs to be held tight against the netting, occlusive even BUT as mad777 pointed out they need to breath...it is against a tarp's nature to breath (well).
Last week in the Ocala I used a BBO from AHE (another piece of kit by Paul that is just mighty fine) and enjoyed the additional degrees it gave. I think the BBO is BlackBird specific but it is rather amazing how Paul engineered it to fit so well with that hammock.
The question you have to ask=is it worth the 5.4 ounce weight penalty. Most times my answer is yes and depending on time of year (when water that falls is solid) you might be able to leave the tarp at home.
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