Suggest they get the drive-in ice studs instead of calks. They grip very well, do not protrude very far from the shoes, yet are EXTREMELY grippy on slick or icy surfaces. The nearest Hunt has most of the horses on these studs and go out twice a week in all weathers except sheet ice. Sheet ice cuts up the hounds, not because the horses have no grip.
We have used these stud on our horses for 30 years, love them. Horse is very confident when they know their hooves will stay under them on all surfaces.
They only stick out a very small amount, so any kick is not going to make big holes. Stud is only about 1/4 inch on its face. Made of tungsten carbide, they self sharpen by wearing down the stud’s collar as horse moves, to stay grippy. They do not “stop” the leg column hard like borium, drill-tek or calks. But the horse does stop well, just does it without the leg impact of hard stopping traveling up the leg column.
It you have snow, they should also get the snow-rim pads to prevent ice balling up in the hoof. Leaves the sole and frog open for easy cleanimg daily. Full pads (bubble pads) covering the sole tend to get mud under them, bubble quits popping, quits pushing out the build up in the shoe. And you can’t clean under them. Once the packing falls out, the mud loads itself in there. Might work better if you don’t get the freeze-thaw all winter lIke we do in Michigan… Ground and snow get cold, stay cold for winter.