Most Halloween grey wigs are made from synthetic fibers—commonly polyester or other faux-hair materials listed as 'synthetic.' Some kids' wig sets also list plastic for parts or included props.
Many adult and teen Halloween grey wigs are one-size-fits-most; several styles include adjustable caps or elastic for a better fit. Some listings specify cap circumferences in the range of about 18" to 25".
Some listings sell just the wig, while others bundle accessories. Examples include fake beards, false eyebrows and wig caps; kids' sets often add play props such as glasses, chains and necklaces.
Package sizes vary: many are sold as a single wig, some as 2-piece sets, and kids or accessory kits list larger counts such as 5- or 7-piece sets.
Grey wigs are marketed for Halloween and costume parties, cosplay and theatrical use, and some kids' grey wig kits are specified for 100-day school celebrations and dress-up play.