The phrase "light padding" means adding a small amount of extra material or cushioning to make something slightly softer or more comfortable. Full definition
It has seamless cups, along with light padding for an extra layer of coverage. (bestproducts.com)
Light padding at the shoulder and through the rails serve several purposes. (havasling.com)
The long sleeves are not detachable and have slightly lighter padding than the rest of the sleeping bag to allow babies to move their arms without restricting them. (slumbersafe.com)