They also provide thermal comfort when walking on tufted rugs with bare feet, and larger pieces provide insulation which may reduce the cost of heating. Rugs or wall hangings made from wool fibres have been shown to improve air quality in indoor spaces. Wool acts as a filter through which contaminants such as sulphur dioxide and nitrogen are absorbed.
Thermal comfort is achieved by walking on tufted rugs with bare feet, and larger pieces of these rugs can provide insulation that might lower heating expenses. Rugs or wall hangings made from wool fibres have been shown to enhance indoor air quality. Wool functions as a filter absorbing contaminants such as sulphur dioxide and nitrogen.