Body wraps have been around for centuries and they have, in the last twenty years, accumulated a great deal of nonsense around them. The most extravagant claims — that wraps melt fat, that they detoxify the body in some measurable way, that they reduce circumference by inches in a single session — are not serious. The real effects of a good wrap are quieter and worth knowing.

There are essentially two traditional wraps that I still send people for: a clay wrap and a seaweed wrap. Everything else is a variation. The honey wrap, the chocolate wrap, the wine wrap, the various branded proprietary blends — they are mostly the clay wrap with extra ingredients added for the menu.

What a clay wrap does

Clay binds to oil. When a layer of warm clay is applied to the body and allowed to sit for twenty minutes, it pulls a small amount of surface oil and surface impurity into itself. When the clay is rinsed off, the skin underneath is genuinely cleaner than it was — not in a dramatic, life-changing way, but in a real and measurable way. The skin feels tighter, in the good sense, for the next day or two.

A good spa will use a clay that suits your skin type. Green clay for oilier skin. Pink clay for sensitive. White kaolin for very thin or reactive skin. If they use the same clay for everyone, the wrap is theatrical rather than therapeutic.

What a seaweed wrap does

Seaweed wraps work by a different mechanism. The minerals in seaweed — magnesium, iodine, certain trace minerals — are absorbed in small amounts through the skin. The warmth of the wrap dilates the surface vessels and improves the absorption. The result is a kind of mineral bath delivered over the whole body at once. It feels, after the wrap is rinsed off, as though the body has been quietly nourished from the outside.

I send people for seaweed wraps after periods of heavy travel, after surgery (with their surgeon's blessing), and during the deeper part of winter when most bodies feel a little depleted. They work. The effect is not dramatic, but it lasts about a week.

A home version

You can do a small version of a clay wrap at home. Buy a small jar of cosmetic green clay from a herb shop. Mix two tablespoons with warm water until it is the texture of yoghurt. Apply it to the upper back and shoulders — the part of the body that gets the dirtiest from sweat and clothing — and leave it for fifteen minutes. Rinse in the shower. That is the entire ritual. Once a month is plenty.

A wrap is not a transformation. It is a kindness paid to the skin. That is what it is for.

Do not expect miracles and you will not be disappointed. Expect a small reset, and you will get one.