Q-Core SLX Insulated

Exped Ultra all the way. I have the 5R, mummy, and it is perfect for a side (and rotisserie) sleeper. (I do not find the mummy shape a barrier to comfort and it’s a lot lighter than the rectangular model.) Big Agnes’s Rapide is also very comfortable — I have the Q-Core SLX, the Rapide’s predecessor — but it’s true that it feels colder than the R-value would suggest. The Exped in my experience feels accurately rated.  I use my little foam sit pad as a knee pillow, and be sure you have a high enough pillow, too. I slept comfortably this way for three months on my Southern Alps traverse. 

I have a big agnes q core slx that I paired with a diamond park bag from them. Granted both have been discontinued, but at 6'4 and around 315lbs as a side sleeper I had very little pain (hips and shoulders would occasionally touch the ground). Would see what BA has for current pads and find something similar size wise

I’ve had a big Agnes q core SLT (like green) r value around 4. It was amazing. Lasted two seasons, then started a slow leak that was not able to find. I ended up throwing it out but 10/10 would buy again. I’m a side sleeper/stomach sleeper and it was perfect for me. 5’8 200lb

Big Agnes Q-core, they make a wide / long one with a Decent R- value that still rolls up to about the size of a Nalgene. About 3 - 4 inches thick I believe.

I’ve had an Exped DownMat for several years. It’s amazing. My last sleep setup was a Big Agnes bag with their Q-Core pad. Agree, too narrow and low R value. Sold them both and got the Exped. I’ve slept in my truck bed, on a plywood deck, many times. The Exped is pretty damn nice, and I’m a 225 lb side sleeper. Do it, OP, you’ll be glad!