They’re warm, cosy and comfortable, easy to get your feet in and out of and, unlike a lot of thermal boots, easy to walk in.
But they’re not waterproof. As the tech spec says, they’ll repel water, meaning that you’re not going to get your feet wet when you walk in wet grass, but they are not meant for paddling in.
I suggest that you buy them at least one size bigger than your normal shoe size, maybe even two sizes bigger if you intend wearing them with thick socks. Try them on before you buy and then you’ll know for sure what size is best for you.
They’re a good boot for comfort and warmth and for walking a mile or so. Any further and you’d be better with a more expensive but pukka walking boot.