PACIFIC Pro & Pro Super Solution Hair Serum (55ml / Refill 150ml) For hair that has gone beyond ordinary damage—severely dry, brittle, and distressed hair, as well as fine, weakened hair due to aging. This professional-grade leave-in hair treatment helps lock in penetrated hair-protecting ingredients and moisture, leaving hair supple with beautiful hydration and radiant shine. How to Use: After shampooing or conditioning, apply evenly through towel-dried, damp hair. Dry with a hair dryer or similar styling tool. No rinsing is required.