The ZEN Charcoal uses the same charcoal fiber technology as the Kishu Binchotan — fine charcoal powder kneaded into the yarn before weaving — but in a different construction. One face is gauze, one face is pile. The gauze side dries faster and feels lighter against the skin. The pile side absorbs. The overall weight is lower than a standard terry towel, which means it dries between uses rather than staying damp. The better choice for humid bathrooms or anyone who prefers a lighter towel