They don't have to be, just depends on how beefy of a sock you want. PapaSmurf makes one that is just Momentum 90 and weighs in at 6.52oz and a cheaper one that is made of uncoated 1.1oz ripstop which . This one has no insulation so it solely works on the principle of creating a micro climate around your hammock. Here is the link:
http://www.mydiygear.com/pages/proje...wintersock.php
MacEntyre makes some out of canvas and he makes one out of nylon. The nylon one comes in an insulated and non insulated model. It is listed as 16oz but Im not sure which model that is for. Here is the site:
http://www.mollymacpack.com/new.html
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