Cotton is a natural fibre obtained from the cotton plant whereas polyfills consist of synthetic fibre.Cotton pillows are completely natural, free from synthetic materials, and are hypoallergenic. Cotton stays cool against the skin, unlike polyester, since cotton fibers breathe better than synthetics. Eventhough cotton pillows have these advantages people buy polyfill pillows because
Cotton pillows start out fluffy, but over time, flatten out a bit and become somewhat hard. They are not as puffy or plush as down or polyester pillows. Because of this, they may feel unusual at first, if you're used to a pillow filled with down or polyester. Cotton holds a lot of moisture, so when washing the pillow, it takes much longer to dry than polyester. Washing and drying may also change the shape or feel of the pillow a bit.
whereas polyester being a synthetic polymer pillows are easy to come by and inexpensive to replace, costing half as much as some other types of pillows. They offer plush support for the head and are sold in various levels of firmness available, allowing options for the desired head-support level. These pillows can be machine-washed and dried, unlike many other types of pillows, and dry relatively quickly.