The SPEs main benefit IMO is the wider width it provides you with the 'wings'. During my first hang when I used the Thermorest - it was just too narrow and I found I had cold spots on either side. Wasn't really an issue because the temps weren't that low but it would have been if it was colder.
I'm actually considering taking an intro to sewing class so I can start doing some DIY stuff like an SPE... My wife thinks I've gone totally bananas
Jim
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