US-based spa operator Steiner Leisure has announced it has agreed to continue providing spa and beauty services for Crystal Cruises for the next five years.

The renewed agreement will cover Crystal Cruises' two existing ships - Crystal Symphony and Crystal Serenity - as well as any additional ships coming into service over the course of the agreement.

The design of spas onboard the ships employs the principles of Feng Shui while signature treatments include a Japanese Silk facial, a wellbeing massage and an aroma stone massage.

Leonard Fluxman, president and CEO of Steiner Leisure, said: "We believe that our unique approach to therapeutic spa luxury fits very well with Crystal Cruise's commitment to providing all of its customers with superior service and care while onboard."

President of Crystal Cruises Gregg Michel said: "We are delighted to continue our relationship with Steiner."

Steiner Leisure is a global provider of spa services with operations including spas and salons on 130 cruise ships including Carnival Cruise Lines, Cunard/Seabourn Cruise Lines and Silversea.