We have 3 of the vests. I really like them a lot. They fit from 6' 170lbs to me at 6'4" 225lbs. They feel heavy carrying them out to the truck, don't really notice them on. They distribute the weight better than a pack, way better. I am 6'4" and a little under 225 and there is a LOT of room for me too expand. 6' 275lbs no problem. I run hot, rarely run anything more than a base layer and shell and I am not sweating any more wearing the vest, not sure why. Also, I run a Troy Lee soft armor shirt under the vest. The vest has an armor "kit" that I installed and like, the shoulder pads help carry the load and the chest armor protects the ribs. Back to the Troy Lee shirt. It is a bunch of small pads with air channels in between and this seems to help air circulate under the vest. I was worried it would make me hot too but the opposite is the case. I really like the pockets on the front of the vest too.