La Mer The Treatment Lotion Hydrating Mask is a skin-hugging technology and millions of micro-fibres that deliver a concentrated surge of renewing hydration, this innovative sheet mask visibly plumps and energises for a healthy-looking glow in minutes.. Skin Type - All Types. HOW TO USE. Unfold and place onto clean skin for 8 minutes. Remove and massage excess into skin for an ultimate hydration and radiant energy boost.