I have been reading thousands of posts on Saddlehunter for months, and this is my first post. I have spent over 50 hours in a XL Mantis this season. I usually hunt a minimum of 3 hours. I am a sitter 90% of the time. I was sore for several days after my first hunt that lasted 4 hours. The next two hunts were just as uncomfortable. Being stubborn and cheap, I was bound and determined to make this work. Adjusted bridge length (longer is better for sitter), tether height (higher is better for sitter), microfit adjusters helped to put more load under the legs and off my back, etc. These adjustments helped, but still not comfortable enough to keep me from constantly adjusting to try and relieve pressure somewhere. This constant movement spooked a lot of deer. I then got the idea to try football hip pads. I bought some Bike brand hip pads on eBay. I ran the Mantis waist belt through the front slot on the hip pad on each side. The hip pads helped distribute the pressure across my hips and due to the thickness of the hip pads, it actually provided a little space between the waist strap and the small of my back. This was a major game changer for me and the only way I could have kept hunting with the Mantis for more than 1 hour. I will be getting me a JX3 when available, but I will be using the NFL version Mantis next season scouting and for run and gun setups. The hip pads obviously add some bulk (but not much weight) and will remind you of the two a days of your youth, but my 50 year old body sure appreciated not being sore two days later.