I caught frost bite (mild) while in korea in the servic, and now must use good warm boots. I am currently using winchesters 1600 thinsulated boots. I can literaly stand in water during winter and not feel the cold yet on days say in the 30's or 40's they are still comfortable. I payed $170 for them but I no longer have any concerns about cold feet. I also use their 400 tinsulates for early season here in northern Illinois. They are well worth the money!!!