- Tart Collections black Charlotte bikini - Stretch-nylon - Top: detachable padding twisted front ruched sides fully lined- Briefs: low-rise fully lined - Slips on - 90% nylon 10% elastane - Hand wash - Lotion sunscreen oil and chlorine can cause discoloration of this item; this is not a manufacturing defect. Please follow care instructions to keep your swimwear in the best condition