Ironing alone is unlikely to cause significant shrinkage in jogger pants made of 98% cotton and 2% spandex. The spandex (also known as elastane or Lycra) in the fabric provides stretch and elasticity, making the pants more resistant to shrinkage compared to 100% cotton garments.
The main factor that causes cotton fabric to shrink is the application of heat and moisture, typically during the washing and drying process. The spandex fibers in the fabric, on the other hand, are more heat-resistant and do not shrink like cotton does.
Ironing can remove wrinkles and creases from the fabric, but it won't result in the same kind of shrinkage as washing and drying. If you want to minimize any potential shrinkage in the legs of your jogger pants, it's best to follow these tips:
Wash in cold water: Use cold water for washing to reduce the chances of significant shrinkage in the cotton fibers.
Air dry or low heat drying: Avoid high-temperature drying, as excessive heat can cause more shrinkage. Instead, either air dry the pants or use a low heat setting on your dryer.
Stretch after washing: When the pants are damp after washing, gently stretch them back into shape to help maintain their original size.
Follow care instructions: Always check the care label on the pants for specific washing and drying instructions. Following the manufacturer's guidelines can help preserve the quality of the fabric.
Keep in mind that some minor shrinkage may still occur over time with regular washing and wearing, but following the above tips should help minimize it.