How does the cooling sensation actually work — is the skin temperature really dropping?

The cooling effect comes from menthol and camphor interacting with sensory receptors in the skin, not from an actual temperature drop. Menthol binds to TRPM8 receptors — the same ones that respond to cold temperatures — so your brain registers a cooling sensation even though skin temperature barely changes. Camphor adds a stimulating, slightly prickly feel that many people describe as "invigorating." Together they create the classic horse-balm experience: a brisk, spreading coolness that peaks within a minute or two and then fades gradually over 15–30 minutes. Because the effect is neurological rather than thermal, you can safely reapply once the sensation fades if you want it longer. The eucalyptus and rosemary oils amplify the fresh aroma during application, while the aloe, chamomile, arnica and lemon balm extracts are there for skin-conditioning — they help the balm feel comfortable rather than drying as the volatiles evaporate.