Definition - What does Tack Bra mean?
A tack bra is a bra insert full of sharp upholstery tacks or thumb tacks. Tacks are pinned onto the bra insert and the sharp edges of the tacks are in direct contact with the wearer. A tack bra is often used in BDSM to further bring a person into submission. It is supposed to bring heightened sensations and awareness of the body while enduring the sharp edges of each tack as the wearer moves.
Kinkly explains Tack Bra
A tack bra is a bra insert that has several sharp tacks pinned through it. As a result, the sharp and needle-like ends of the tacks are directly pressed onto the wearer's breasts. This causes pain and awareness of the tacks poking against the breasts. It is commonly used as a form of submission for a submissive.