Calvin Klein Modern Flex Thong. Calvin Klein Underwear Modern Flex ThongRefresh your collection with this Calvin Klein Underwear Modern Flex Thong. Constructed with an elasticated waistband for comfort, it features flat lock seams to prevent chafing. This thong is a lightweight design with a signature logo, finished with Calvin Klein Underwear branding.• Thong• Elasticated waist• Flat lock seams• Lightweight• Signature logo• Calvin Klein Underwear branding• 92% cotton, 8% elastane• Machine washable