Is this boot fully waterproof?

It is described as a waterproof mid field boot, so it is meant to keep feet dry in wet grass, mud and light rain. Standing water above the boot's height will still get in.

What is a mid field boot good for?

Field boots are made for walking on wet, uneven ground such as trails, farmland and yards. The mid cut adds ankle support over a low shoe without the bulk of a tall boot.

How does it compare with a hiking boot?

It trades some cushioning and breathability for simple weather protection and a classic field-boot shape. Dedicated hiking boots usually offer more padding and a more aggressive outsole.

Will it keep my feet warm in winter?

Waterproofing blocks moisture but does not add insulation. In cold weather you will likely need warm socks, and the boot is not a winter pac boot.

How should I care for a waterproof boot?

Clean off mud after use and let the boots air dry away from direct heat. Check the waterproofing over time, since mud and wear can reduce how well water beads off.