When the day is over and you’re ready to relax, these Calvin Klein Sleep Pants are the answer. Made using soft loopback cotton, side pockets offer practically whilst a signature branded elastic waistband completes the design. 98% Cotton 2% Elastane, Elastic Waistband, Side Pockets, Calvin Klein. Calvin Klein Men's Sleep Pant Pelican Stripe. Pyjamas by Calvin Klein Regular rise Elasticated waistband Branded taping Side pockets Straight fit.