Medium rise waist with a sheer lace panel under the waistband. This bikini is black and is composed of 80% nylon and 20% elastane. Wash Care: Machine wash. Any underwear or swimwear which have been opened or their protective seals removed, cannot be returned due to hygiene reasons unless faulty. Medium coverage with an elasticated waistband. This bikini is black and is composed of 89% nylon and 11% elastane. Wash Care: Machine wash. Any underwear or swimwear which have been opened or their protective seals removed cannot be returned due to hygiene reasons unless faulty.