Caring for Polyester, Nylon and Acrylic Without Damaging the Fibres

Synthetic fabrics are generally durable and easy to wash, but they have specific failure modes that natural fibres don't share: heat damage, pilling, static, and odour retention. Each requires a different approach.

Heat is the main risk for all synthetics

Polyester, nylon and acrylic are all petroleum-derived plastics at the molecular level. High heat — from hot water, a hot dryer, or a hot iron — can melt, distort or permanently crease the fibre. Polyester can tolerate 40°C wash and low dryer heat. Nylon is more sensitive and should be air dried. Acrylic is the most heat-sensitive of the three and should always be air dried flat. For all synthetics, the care label temperature is a hard limit, not a guideline.

Pilling: causes and prevention

Pilling in synthetics is caused by short or broken fibres tangling at the surface. It's accelerated by abrasion — rubbing against other garments, the inside of a dryer, or rough surfaces. To reduce pilling: turn synthetic garments inside-out before washing, use a mesh laundry bag, wash on a gentle cycle, and air dry rather than tumble dry. Existing pills can be removed with a fabric shaver. Acrylic is the most pill-prone of the three; high-quality polyester pills less than cheap versions of the same fabric.

Odour retention in synthetic activewear

Synthetic fibres trap body oils and odour compounds between fibres in a way that natural fibres don't. Standard detergents are less effective on this than enzymatic or sports-specific detergents. Fabric softener makes the problem worse by coating the fibres and trapping odour further. For activewear: use an enzymatic or sports detergent, wash at 40°C, skip fabric softener, and air dry. Adding a cup of white vinegar to the rinse cycle can help with persistent odour in synthetic garments.