Colour: dark blue, blackFastening: no fastening, in rubberMaterial: material 1 - 95% cotton, 5% elastane material 2 - 86% cotton, 9% viscose, 5% elastaneMaterial Properties: ElasticExtra information: Underwear or swimwear cannot be returned for hygienic reasons.Sustainability: Oeko-Tex Standard 100 (international testing and certification system for textiles made only from non-toxic materials)