When Brad Brooks from Argali Outdoors said he had a Thermarest sleeping bag to test out, I was intrigued. I didn't even know they made sleeping bags. The bag I'll be testing out is the Hyperion 20F. Retail price is $419.95 and it features 900 fill Nikwax Hydrophobic Down. I'll post an ongoing review here in this thread so subscribe at the top if you want to be notified as this goes along.