Regain is a measure of the moisture content of wool and is the mass of moisture in a mass of textile fibres expressed as a percentage of the clean oven-dry mass of fibre. Wool is traded on the basis of its mass at a set agreed upon regain. Wool will absorb and release moisture in its environment, thus this method maintains a true and correct method of sale. Moisture content can also affect static charge in the wool.

Antistatic

Lubrication and moisture in a relatively dry environment, such as in a cotton mill, must be considered to suppress static electrification of wool. Anti-static carding oils, over applied can cause issues in dyeing thus a moderate application remains desirable. An important factor in static charging is the delay between additive application and spinning. Because of the loss of efficacy of antistatic control additives with time the correct choice of additive and the minimum delay before processing are helpful in controlling charge.  It is recommended that types and quantities of lubricant and anti-static additives are discussed with Michell Wool technical staff to ensure best outcomes that suit the mill environment.