Bettinis Key Hole Halter Top in White. - size M (also in ) Bettinis Key Hole Halter Top in White. - size M (also in ) 83% nylon 17% spandex. Hand wash cold. Halter strap ties around neck. Back twisted multi-strap detail. BTIN-WX181. 730. Bettinis bikinis fun, flirty and a full of life. Coming from the inspiration of North Carolina oceans, sand and seashells, Bettina gives a play on her name to create Bettinis so that every wearer can feel posh running down the beach.