Are the Salomon Toundra Pro Clima boots actually waterproof?

Yes. They use Salomon's ClimaSalomon Waterproof membrane, a bootie inside the upper that blocks water while letting some moisture escape. Owners report dry feet in slush and wet snow.

How warm are they, and can I wear them in mild weather?

They are built for freezing and below-freezing conditions, with a thick midsole and insulated upper. In mild weather or heated indoors they get uncomfortably hot.

How do they fit compared with other Salomon boots?

They use a regular width and neutral support with a tall shaft. Most buyers take their usual Salomon size; those between sizes or planning thick socks often go up half a size.

Are they good for hiking?

For short, slow walks on snowy or muddy trails, yes. The weight and stiffness make them a poor choice for fast or long hikes; a lighter insulated hiking boot suits that better.

What is the drop and how does it affect walking?

The drop is 11 mm, from a 19 mm heel to an 8 mm toe. That is a fairly level, stable platform for a winter boot, which suits walking and standing more than running.