New for the Spring 2011 Season This design is called Cottonball, and has a foliage pattern in blue and yellow. 365 Trunk - Soft, cotton stretch everyday trunk. Functional fly. Signature logo waistband. 95% cotton, 5% elastane. Calvin Klein introduces 365, the latest evolution of Calvin Klein underwear for men. Lightweight stretch cotton. New modern basics. Engineered for fit and comfort.