I like to look at those. Right now we have ideal conditions. The soil is frozen. On top of it is a 1 inch layer of ice and on top of that 1/2 inch of of semi frozen snow. This makes for perfectly stable hoof prints.
The two closest ones are from Gus, left, a front hoof, right a hind hoof. It looks as if the hooves are very comfy :-)! I think if the horses could order a terrain that they liked most they would order this terrain. The ground is solid, but the ice-snow does nicely conform to the hoof and gives support to sole and frog. Both horses move fantastic on that ground.