Mail against your calendar
Most businesses mail when they are worried about revenue, which is usually just after a slow patch rather than before one.
Med spas have a fairly predictable rhythm — busy before events and holidays, quiet in the weeks after. Look at last year's booking data and find the weeks you had capacity.
Then mail four to six weeks before those weeks. A card that fills a Tuesday in a quiet January is worth more than one that adds to a fully booked December.
Your past clients are the list
Med spa clients have unusually high value and unusually low retention discipline. Someone who came three times last year and has not been back in eight months is not unhappy — they are out of the habit.
That list is your first and best audience. They know your practitioners, they have already cleared the trust hurdle that makes new-client acquisition expensive in this category, and the message can reference the actual service they had.
Segment it by service where you can. A card about the treatment someone has already had converts better than a card about your full menu.
The offer needs to protect your positioning
Discounting is riskier here than in most categories. A deep percentage off can cheapen a service whose price is part of its credibility, and it attracts clients who will only ever return at a discount.
Better structures: a specific dollar value on a named service, a complimentary add-on with a booked treatment, or a package price that increases the visit value rather than reducing it.
Whichever you choose, put a date on it. An open-ended offer in this category tends to be read as the new price.
Why modest response rates still work
Direct mail response rates in the low single digits sound discouraging until you multiply them by a med spa ticket.
Mail 400 past clients at $1.19 and you have spent $476. If eight book — two percent — and the average visit is several hundred dollars, the drop paid for itself several times over on first visits alone, before any repeat business.
This is why the category suits mail. The arithmetic tolerates a low response rate in a way that a low-ticket business cannot.
Make the card look like the service
This is one category where design quality genuinely affects response, because the card is a sample of your taste.
A cluttered card with four offers and a starburst undermines a premium positioning no matter what the copy says. One image, generous space, one offer, one action.
And hold a printed proof before you commit to a run. Colors shift between screen and paper, and a card that looked elegant on a monitor can arrive looking cheap — which, for this audience, is worse than not mailing at all.