Dr. Martens Unisex-Adult Embury Leather Chelsea Boot

Are these waterproof?

Are these comfortable enough to use as a walking shoe? I live in a city and tend to walk 4-5 miles a day.

I wear a size 10 in us mens, should i buy the “womens11/men’s 10”?

I normally wear a size 10 us in men’s boots, should i get the 11 women/ 10 men size?