Winter riding boots

First off, I'm sorry if this is in the wrong place.
I am looking for some recommendations for very warm winter riding boots. I am taking lessons in a indoor, unheated arena, and my toes are already going numb! I am in Canada, so it's only going to get colder.
Thanks a lot.

Just posted this exact same post in another place but here you go:

This: Mountain Horse Stella Polaris Winter Rider

Plus

These: Amazon.com: Little Hotties Adhesive Toe Warmers...


I don't know what else to say but AWESOME. And yes the boots are expensive but I'll have mine for years. They are great quality boots. They are wonderful without the warmers - only use the warmers on days when you'll be out at the farm for a good 4 hours and the cold is unbearable. Even then you'll only really need the toe warmers towards the end of that time frame as the boots do a really great job of insulating.

Mountain horse!!! So warm