Yeah, you sweat like a pig in grundens in the summer.... We wear sweats under them, and change out at least 3-5 ti es a day depending on work load...
In the winter it's all I wear, I go for the gage brand (it's their recreational/lighter duty Line) and I swear by that just the same
Other similar brands are Guy Cotten, and red ledge, but grundens and xtratuff boots is all I wear... Word of advice on boots, get Bama Socks, made in Poland, they wick sweat away from your socks, doesn't matter if it's +90 or -60, keeps your feet dry in rubber boots.