I live in ga where every season, the air is soaking wet. So this is mainly a condensation issue. I'm juggling two of the borah bivys. The all mesh and the standard. I was wondering if the standard would still breathe well enough for the 90deg summers and if the mesh would be sufficient for late fall into the 30's. I really just want ONE for 3 seasons. I will be using a tarp to the ground, pad, and a bag or quilt. Would love your thoughts. Thank you.
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From my myog experience Momentum fabrics are some of the least breathable 'breathable' fabrics. If condensation is always an issue in your locale I wouldn't consider a full topped M90 bivy.
Conversely bug bivy's won't really cut wind and retain heat so your risk of convective heat loss is far greater in the colder months if the wind is up even a bit is far greater than with a M90 bivy. Bug bivy's are obviously significantly less thermally efficient than a solid topped bivy. Unless you really need it for bugs, I wouldn't bother, you could just sleep on a ground sheet. If you're using a full bag you'll avoid drafts better than with a quilt in a bug bivy.
Sounds like you want the best of both worlds, in your case this is what I would do...
See if he can meet you part way... tell him about your condensation concerns and get the bivy made with a Momentum top that has a netting strip up the middle to help with ventilation. This will help keep drafts out but allow better airflow and help aid in condensation management.
http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=96337http://sticksblog.com/2013/07/05/borah-bivy-modification/http://cesarandthewoods.blogspot.ca/2013/05/section-hike-and-bivy-modification.htmlGood luck!
