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simpLite quilt GramXpert . We use the following apex weights of insulation per temperature rating. I would go with the 7.5 ounce apex for that. Climashield Apex 6.0 oz from hofmanoutdoorgearsupply.ca However, in general (by no means an en rating), each layer of climashield gets you 20 more degree's starting at 40 degrees with 1 layer. I sleep hot, but i also didn't have it tucked in completely or used my pad straps, so it seemed pretty accurate to me. They gave me an estimate over the phone and said someone would be.