dry towel; dry cloth
Refers to a towel or cloth that is dry, as opposed to a wet one. Often used in contexts like 乾布摩擦 (dry towel rubdown).
Rubbing your body with a dry towel improves blood circulation.
dry towel rubdown
Compound of 乾 (dry) and 布 (cloth). The reading かんぷ is the on'yomi for both characters.