Briefs from Calvin Klein Jeans. Choose breathable comfort and a sporty look with our signature Modern Cotton underwear and loungewear collection. These briefs are designed in a classic colourway with a logo waistband, and are made from a regenerative cotton elastane blend. They sit at a normal waist and feature Calvin Klein's signature elastic waistband. Main composition: 95% regenerative cotton, 5% elastane. Sustainability Certification: RegenAgri. Care instructions: Machine Washable at 30°C on a gentle cycle. Low heat iron.