I just came in from a little backyard hang. The overnight low was only 20 here, not the proper winter temps many here are experiencing but it's all I've got. I slept under the stars. I used my Mt Washington 4 on a hike in similar temps last month and got a touch of CBS. I emailed JRB and they promptly replied, advising me to ensure the half-hitch is as close to the end of the hammock as possible. I also clipped the two mini-biners together over the top of the hammock ridgeline as Just Jeff suggested. Last night I felt absolutely nothing but warmth. My hammock was a no-net hennessy hyperlite (thanks Gnome). I tied the side pullouts to the corresponding pullouts on the Mt Wash to keep the hammock from wadding up in the middle of the hammock as I entered. I woke up at 0230, to answer the call, I was hot. Exiting and entering a netless hammock is so effortless, and just hiking the bottom of the Wren up to relieve yourself is so easy, not to mention warm. A little cool air on your legs for a few minutes means nothing when your core is ensconced in down. I wore only running tights, thin ankle socks, a visa endurance tee shirt and a thin zip neck long sleeve tee, about what I'd start hiking with in this weather. When I re entered the hammock I left the zippers on the Wren's arm holes open and loosely closed the hood around my face. I stayed toasty until 0630 when my sheppard started licking me in the face. I got the Winter Wren from Quoddy last year, this is my first chance to use it. The base Winter Wren is rated for 25 F, Quoddy ordered this one with 2 oz (IIRC) overfill. With 2.5in baffles and the overstuff, this bag is good down to at least 10 F for me, add a down vest and who knows. Is it as warm and do I like it as well as my Rocky Mountain No Sniveler? I don't know and I'm not sure. Hopefully I'll have the low temps this winter to test. With an overnight low of 20 F the Winter Wren passed with flying colors, the Mt Washington 4 is of course good down to at least zero for a warm sleeper. A full length thermarest SPE set up on top of a Mt Wash 4 would get you down into "Shug" conditions for sure. If the Mt Washington has a downside, it is the added bulk to your pack, I can get it all in my Catalyst with 5-6 days food without a problem though.
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