Tying Long Hair (髪を結んで入る - Kami o musubu)
Worshippers with long hair must tie it up securely with a hair band or clip to prevent their hair from floating or soaking in the communal bathwater, ensuring a clean and hair-free environment.
An extension of 'Omotenashi' consideration for other guests. Having strangers' loose hair floating around you while soaking is unpleasant, and loose hair can clog the bath's thermal circulation filters.
Before stepping into the hot spring, tie your hair into a high bun or ponytail, or tuck it completely inside a plastic shower cap. Ensure no strands touch the surface of the water.
What is the correct etiquette for bathers with long hair at an onsen?