On the last location of Chasa, you can find an exoskeleton! To do this, it is necessary to break on a break towards the end of the game, and after the murder of the first monolithica with Gauss-gun to have all the time on the right (2 times) and at the beginning of the room you will see the left pass, go down the stairs and the exoskeleton lies in the blue box. Exoskell increases the maximum weight from 60 to 80 kg, the protection against bullets is 60%. The thing is certainly good, but from radiation weakly protects 30%, so you need to go there with artifacts such as Sea Yozh (radiation -30). Good luck!