HiddenValor Big Boys Cotton Pajama Pants Made with ultimate softness double brushed flannel cotton. A soft cotton-covered elastic waistband with adjustable drawstring. Since these are cotton they will shrink, please keep that in mind when selecting your size. IMPORTANT NOTE 1. They are not flame resistant, and do not comply with the U.S. Consumer Product Safety Commissions childrens sleepwear regulations. 2. Specifications of the computer, there may be a difference in color depending on the resolution of the monitor. 3. There maybe 1-2cm difference depending on the measuring method/location. WASHING & CARE Our pajama pants are machine washable. We recommend washing them inside out with other “soft” items or undergarments. Not recommended to be washed with jeans and other abrasive fabrics.