What Is Actually in a Cotton Round?
Pull a cotton round from the bag and it feels simple — soft, white, circular. But the manufacturing process that creates it, and the materials it contains, vary significantly between disposable and reusable versions. Understanding the difference matters for making an informed choice.
Disposable Cotton Rounds: The Manufacturing Process
Most disposable cotton rounds are made via a nonwoven textile process — meaning the fibres are bonded together without weaving or knitting.
- Fibre preparation: Raw cotton is cleaned of seeds, leaves, and debris (a process called ginning), then combed to align the fibres (carding). Often, polyester staple fibres are blended in at this stage — typically 30–50% polyester — to improve wet strength and prevent the pad from disintegrating during use.
- Web formation: The fibres are spread into a thin, even web using an air-laying or carding machine. This web is the raw material for the pad.
- Bonding: The fibre web is bonded using one of several methods: thermal bonding (heat melts the polyester fibres, which fuse as they cool), chemical bonding (binders are applied and cured), or hydroentanglement (high-pressure water jets entangle the fibres). Each method affects the final texture and performance.
- Die-cutting: The bonded sheet is fed through a die-cutter that stamps out circles. The circular shape maximises yield from rectangular sheets. Offcuts are typically discarded or recycled internally.
- Packaging: Rounds are stacked, counted, and sealed in cellophane or plastic bags.
The entire process is highly automated and optimised for speed and cost. A single production line can produce millions of cotton rounds per day.
The Polyester Problem
The inclusion of polyester in most disposable rounds is the key environmental issue. Polyester is derived from petroleum (it is a form of plastic), does not biodegrade, and sheds microplastics when in contact with water. When you wet a cotton-polyester round and sweep it across your face, microscopic plastic fibres may transfer to your skin or drain into the water supply. When the pad goes to landfill, those fibres remain there indefinitely.
Even "100% cotton" disposable rounds sometimes contain chemical binders or wet-strength agents that slow their degradation. The label tells you about the fibres, not the additives.
Reusable Cotton Rounds: A Different Manufacturing Route
Reusable rounds follow a conventional textile manufacturing process — the same fundamental steps used to produce a t-shirt or towel, but at smaller scale and with tighter quality control for performance through repeated washing.
- Fibre selection: Organic cotton or bamboo are the most common choices. Organic cotton is grown without synthetic pesticides and certified to standards like GOTS (Global Organic Textile Standard). Bamboo is fast-growing and requires fewer inputs, though the chemical process used to convert bamboo to fibre (viscose/rayon processing) has its own environmental considerations.
- Spinning: Fibres are spun into yarn. The yarn count (thickness) and twist determine the final fabric's texture and durability.
- Weaving or knitting: Yarn is woven or knitted into fabric. Terry weave (used in towelling) creates loops that increase surface area and absorbency — a common choice for skincare rounds. Knitted fabrics offer stretch and softness.
- Cutting and finishing: Circles are cut from the fabric and edges are finished (serged or bound) to prevent fraying through repeated washing. The edge finish is critical for longevity.
- Quality testing: Reusable rounds intended to last hundreds of washes must pass tensile strength, wash fastness, and shrinkage tests.
LastRound's Design Approach
LastRound was designed specifically to address the durability failures common in early reusable cotton rounds: fraying edges, shape loss after washing, and reduced absorbency over time. The result is a round engineered to maintain performance through repeated use, with a self-cleaning storage stand that keeps rounds hygienic between uses.
For a comparison of LastRound against other reusable formats, see the complete guide to reusable cotton rounds.