A custom orthotic is designed to balance the foot and ankle. A winter boot is meant to keep the foot and ankle warm. Typically a winter boot lacks structure and support, since warmth alone is it's primary function. This is especially true when it comes to those such as the popular Ugg boots. Of course, an orthotic isn't going to provide any warmth to the foot. It's only practical to think that the two should work together well.
The problem many people find when attempting to insert their orthotic, which works great in their running shoes, is that a winter boot doesn't provide enough space to accomodate it. That's especially true if the orthotic is full length - encompassing the entire sole of the shoe. Many women who have an additional orthotic for their work or dress shoes are successful in transferring those into their winter boots.
Most of my patients don't have a problem getting any of their custom orthotics into their winter boots. Our philosophy is that orthotics are meant to fit a person's foot...not just a particular shoe. For that reason, the majority of orthotics that we fabricate for our patients are 3/4 length, stopping at the ball of the foot. This allows for maximal support and control using minimal materials to ensure they fit in most, if not all, of their shoes. The orthotics don't even require a change in the size or width of the shoe.
You don't have to sacrifice warmth for comfort or vice versa. Come and visit to see how your orthotics can serve you well in all of your shoes and boots.