Madewell Second Wave Balconette Bikini Top Size Large NWT Features: Sustainable and swim-ready, our Madewell Second Wave collection comes in feel-good recycled fabric. Sporty and minimalist, this balconette bikini top has a square neckline. Moderate coverage. Light support: under-bust band. UPF 50 sun protection. 80% pre-consumer recycled nylon/20% elastane. Do Well: This fabric is recycled from pre-consumer nylon waste like fishing nets, fabric scraps or carpet.