A new destination spa, offering personalised aromatherapies, has opened in Napa Valley, California, US.

The 3,500sq ft (325sq m) Atrio Spa, which forms part of the independently-owned Las Alcobas hotel and resort, features four single treatment rooms and The Sanctuary – a couple’s treatment suite with a relaxation area and private steamroom.

Other facilities include a steamroom, outdoor showers and indoor and outdoor relaxation areas and an apothecary retail area.

There is also a health club fitted with Life Fitness equipment, a yoga studio and a cabana-lined outdoor pool.

The spa’s treatment menu features a personalised aromatherapy experience, which can be combined with selected massages.

Most spa services begin with an apothecary-style “blending bar”, created by Marjorie Charlton, Las Alcobas spa curator.

“Marjorie has consulted with world-renowned aromatherapists and herbalists to create an authentic, easy and effective aroma blending system personalised for every guest,” a spokesperson for Las Alcobas said.

“After a quick blending session, selected organic essential oils are carefully combined to create an oil blend used during the treatment for inhalation and massage.

“At the conclusion of the treatments, guests are gifted a 2oz bottle to continue their aroma experience at home.”

Treatments at the spa use products by organic skincare specialist Naturopathica, essential oil specialist Mountain Rose Essential Oils and ayurvedic supplier Banyan Botancials.

The architecture and interiors of Atrio were created by international design firm Yabu Pushelberg in conjunction with Charlton – who came up with the Vision for Atrio using her knowledge gained from working at Four Seasons spas in Egypt, Thailand, Mauritius and Beijing.

Describing the spa’s unique selling point, Marjorie Charlton said: “Our target market is luxury spa goers looking for a meaningful spa experience which incorporates effective spa products and which are organic and sourced sustainably.

“Atrio spa goers are looking to experiment with a range of treatments by which exploring different modalities and histories by way of Asia looking an authentic experience.”

Atrio is operated in-house by a dedicated spa team. The Las Alcobas resort is independently owned and has signed up to Marriott’s Luxury Collection portfolio of boutique hotels.

The 60-bedroom Las Alcobas was opened in 2014, following a redevelopment of a previous hotel called Grandview. The 3.4-acre property is a historic building originally called the Acacia House, which was a private residence until it was converted into a hotel in 1911.