Made a full length Apex underquilt with two layers of 2.5 under the top 46 inches and one layer under the rest. Expect it to be good to 40 deg.
I previously used the 5 oz for a top quilt; this purchase also for top quilt. Sewing the 5 oz material to the inverted quilt "envelop" taught me that my sewing machine pulls the material significantly, so I hand-stitched the perimeter of the 2.5 oz, which took less time than fighting and seam ripping required on the 5 oz effort. Material is great.
I made a synthetic dog quilt for my dog to match our custom down quilts from Underground quilts. I used the same outer and inner fabrics as UGQs, also purchased from ripstopbytheroll. My dog loves her quilt.
Extremely warm for its weight, easy to work with and sew, and durable enough to withstand a few mistakes and seamrips :) Will definitely use synthetic insulation more often!
Used to improve insulation in a TNF jacket and made a sleep beanie. Lightweight and warm.