The Shivering Metabolic Response
Susanna explains that shivering is important in the beginning stages of cold adaptation, but as the body becomes more efficient at increasing metabolism, shivering subsides. Cold-adapted individuals experience increased energy expenditure and temperature regulation without the need for shivering.In this clip
From this podcast

The Human Upgrade
Episode #1014: Stack Cold Water, Sauna & Breathing to Accelerate Your Metabolism – Susanna Soeberg
Related Questions
Why don't I shiver during cold exposure as discussed in the episode Dr. Susanna Søberg: How to Use Cold & Heat Exposure to Improve Your Health | Huberman Lab Podcast and the clip Cold Training Benefits?
How does shivering relate to cold exposure?
Does deliberate cold exposure increase metabolism as discussed in the episode Dr. Susanna Søberg: How to Use Cold & Heat Exposure to Improve Your Health | Huberman Lab Podcast and the clip The Science of Shivering?