We have added an option to the MMG Nylon Hammock Sock with SEEP called the MMG Pod. This option adds Climashield Apex 3/8" loft insulation, for $40 extra.
We made insulated hammock socks before, but not with highly breathable Climashield insulation. Also, by insulating the bottom, as well as 18" of the SEEP, it wraps insulation completely around you and your hammock.
This is an excellent choice for any temperature. By itself, it is good to below freezing. With a supplemental Under Quilt and Top Quilt, it will take you to very cold temperatures.