I wore the Hyper-comp shirt today while I was working which consisted of moving some stock for my business which were 100-200 lb alder logs, due to where they had to go I had to do it by hand. Anyway, I wore a light poly pro shirt under it to help with any chafing. The first 10 minutes or so it was a different kind of feel, not uncomfortable just different, after that i knew it was there but it felt fine. I noticed a definite increase in lateral stability as I carried the logs. I ended up wearing it for 5 hrs and that also was fine, I never felt constrained or like I had to get out of it. My primary use for this shirt will be freestyle snowmachining and therefore the extended wear time is important. I liked the all over torso support but never felt like i was depending on the shirt like a belt. My fatigue level was noticeably less as well. When I did take the shirt off I had the feeling of swelling up like a good pump. Good product so far, 90 day ironclad waranty search online for Exoforce and it will come up. I have another shirt on the way for a friend who is competing in the winter X games freestyle sled comp, he will be using it during training and I will keep updating this as I use it, might even use it in the gym. Of course that what this shirt was designed for but I like to think outside the box, I can see all kinds of applications for this garment.