Natural 4-ply cotton yarn, thick strands for heavy use. Cotton is the most popular mop yarn in the industry. Its great absorbency and moisture-holding ability makes cotton mops the perfect choice for wet pick-up when getting the floor dry is important. Naturally resistant to harsh chemicals, high temperatures and abrasion, it excels in general maintenance, stripping, scrubbing and rinsing applications. All cotton mops require break-in at initial use. Swish in mild detergent solution and warm water (if available), wring out, repeat 5 times, replace water with fresh mopping solution, and continue on to the job.