Top hats, prepare to doff. Gentlemen's Tonic provides rich and relaxing hair and grooming services to men in an upscale, masculine setting. The name refers to the strengthening and invigorating properties of tonic in a venue that caters exclusively to males, even though it was built by Houston's only all-female construction team, Sisters with Earth-moving Power. The company began in London, where the male-grooming experts have received tons of press coverage. The Houston establishment, featured in Modern Luxury and the Houston Chronicle, is the first location in the United States of America.