Sexy bralettes are typically made from nylon- and polyester-based blends. Examples given include plain nylon and blended constructions such as 78% Nylon/22% Spandex, 92% Nylon/8% Spandex, 95% Nylon/5% Spandex, and various polyester woven fabrics.
Support ranges from light support and light-lift push-up shaping to full-coverage wireless push-up styles. Many sexy bralettes are wireless or soft-cup designs intended to balance comfort with moderate shaping and everyday wearability.
Marketing varies by style. Some sexy bralettes are described for low- to medium-impact activities (examples listed in descriptions include yoga, running, cycling, and gym workouts) and can double as crop tops for casual wear. Others emphasize everyday comfort, seamless layering, or going-out looks without underwires; suitability depends on the specific model and its support level.
Closures vary by design: some are pullover/pull-on styles, others use traditional hook-and-eye rows, and at least one uses a front hook-and-loop fastener.
Many of the listed sexy bralettes are described as opaque, indicating full-coverage fabrics rather than sheer materials.