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Taking My -20 F. down bag to -40 F. ... maybe
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<blockquote data-quote="Litehiker" data-source="post: 1377556" data-attributes="member: 54178"><p>Bramble,</p><p>That sounds like a bag problem B/C it should have kept you warm as toast with teens temps. Last winter my -20 F. bag kept me nice and warm at 12 F. in my solo Moment DW tent.</p><p>->Did you wear a head/neck covering? If not try it again with a fleece balaclava.</p><p>->Your air mattress is conducting heat away from you unless it is a Thermarest NeoAir X-Therm. </p><p></p><p>I recommend you get the least expensive foam filled, self-inflating Thermarest type mattress over your foam pads. But try to make sure the foam pads are closed cell like the Themarest Ridgerest roll-up or Z-Rest folding pads or military roll-up pads. I use a Thermarest Trail Pro on a closed cell foam Ridgerest at -5 F. and am always warm. That combo is truly good at -40 F. <em>with the right bag</em>. </p><p></p><p>As others have mentioned here and in other winter hiking forums, being warm in a -20 F. bag <em>at</em> -20 F. may not work without an additional puffy layer over my polar weight polyester base layer. To be warm at the bag's lowest rated temperature, even with my heavy weight base layer, would require that I have a basal metabolism of a champion endurance athlete or wrestler. But at 74 that ain't gonna happen. My doc says i'm in "excellent condition" but she means excellent for a 74 year old, not a 40 year old.</p><p></p><p>So, yeah, I backpacked the Grand canyon for 4 days this past November from the North Rim down to the Colorado River and up to the South Rim but it was a grind going up. A bit more difficult than it was even 7 years ago. Ya can't defy age, just slow down the process.</p><p></p><p>Eric B.</p></blockquote><p></p>
[QUOTE="Litehiker, post: 1377556, member: 54178"] Bramble, That sounds like a bag problem B/C it should have kept you warm as toast with teens temps. Last winter my -20 F. bag kept me nice and warm at 12 F. in my solo Moment DW tent. ->Did you wear a head/neck covering? If not try it again with a fleece balaclava. ->Your air mattress is conducting heat away from you unless it is a Thermarest NeoAir X-Therm. I recommend you get the least expensive foam filled, self-inflating Thermarest type mattress over your foam pads. But try to make sure the foam pads are closed cell like the Themarest Ridgerest roll-up or Z-Rest folding pads or military roll-up pads. I use a Thermarest Trail Pro on a closed cell foam Ridgerest at -5 F. and am always warm. That combo is truly good at -40 F. [I]with the right bag[/I]. As others have mentioned here and in other winter hiking forums, being warm in a -20 F. bag [I]at[/I] -20 F. may not work without an additional puffy layer over my polar weight polyester base layer. To be warm at the bag's lowest rated temperature, even with my heavy weight base layer, would require that I have a basal metabolism of a champion endurance athlete or wrestler. But at 74 that ain't gonna happen. My doc says i'm in "excellent condition" but she means excellent for a 74 year old, not a 40 year old. So, yeah, I backpacked the Grand canyon for 4 days this past November from the North Rim down to the Colorado River and up to the South Rim but it was a grind going up. A bit more difficult than it was even 7 years ago. Ya can't defy age, just slow down the process. Eric B. [/QUOTE]
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