Airelles Spa by La Mer

The Airelles spa works with two houses: La Mer, for facials built on the Miracle Broth, and Laboratoires Botanique Avancée, the French regenerative-skincare brand tied to the Airelles' own history and reserved for its guests. Beyond the treatment rooms you find what most mountain spas lack: an ice cave and cryotherapy for post-ski recovery, a hammam, a sauna, sensory showers, osteopathy and a hair salon. It is the resort's most complete spa for anyone skiing seriously. We book the rooms ahead, they go quickly in February.