After using this bag for four trips of 3 weeks each…
Fill: Polarguard HV
Temperature Rating: 0 F
Weight: 4 lbs
Price Paid: $185
After using this bag for four trips of 3 weeks each I returned to TNF. I felt cold in it on every trip, even wearing polarflece. The new model with Polarguard 3D has better loft. After four years of use TNF tested it and determined the loft was out of spec and was going to replace it with a new 3D one. I talked them into sending me a Superlight (down, 0 F) instead, they did and since it was on sale at the Costa Mesa store, no charge. Now that's a lifetime warranty.