OK, just received an Exped Travel Hammock to try things out. Considering an underquilt, will use a Thermarest Ridgerest pad for now, but as ever there are so many options that as soon as you settle on a choice there's something else that catches your eye or makes you question your decision. Usage will mainly be in the garden and either bikepacking or backpacking so bulk is important. The first option is temperature rating. I think temperature wise -5C +/- is about right - reading the US hammock forums they reckon take your expected overnight temps then subtract 10F or about 5C. I'm only going to be out in summer and you'd be unlikely to get freezing overnight temps in the UK if you select your site. The next option is full vs 3/4 length: I'm 1m80 tall (5' 11") so looking at the Cumulus underquilts their Selva 250 is 1m80 whereas the 300 is 2m20. I could just fit on the 250, in fact definitely if I have the top of the quilt at shoulder height rather than above my head. Then of course it isn't really a full length, more a 7/8ths! The hammock is fairly short, 2.7m rather than the 3.0 or 3.3 metre that the Americans seem to recommend, so I'm not sure a full length UQ would actually fit as it would extend quite a way along the gathering. The Americans tend to use a short pad under the feet with a 3/4 UQ but looking at the Hammockgear Phoenix as an example of a 3/4 length it's only 1.37m long Bulk/weight wise I think the 3/4 has it. Thoughts? Suggestions?