To start with I'm an indoor hanger, due to health, I have slept in my Blackbird XLC for most of 2 years with no problems. Then I bought a Chameleon complete set after 2 weeks I went back to the Blackbird. I CAN NOT sleep in the Chameleon no matter what I try without getting up in pain, hip and shoulder. After 3 nights in the Bird pain started to fade. Only thing I can think of is the Bird is double layer.