Men's steel toe military style boots size 5 black

Men's black military style boots, steel toe, vibram bottom soles. Men's size 5. I'm a size 7 in women's, and it fit and felt great while on. They were just very tight getting them on and off. Not sure if that is just the way the shoes are supposed to be since military style, or if I should of gone with men's size 6. Good for winter, thick boots. Great condition.