This totally efficient and sanitary laundry net system handles dryer temperatures and laundry chemicals better than nylon bags. Mesh allows ventilation for wet laundry, preventing mildew. Collect, wash, and dry laundry all in the same bag! Bags are made of heavyweight 100% polyester mesh that weighs 2-1/2 oz. per square yard. Sewn ID tags can be ordered from manufacturer at an additional charge of $3.99 per dozen; please specify.