From the website:

BECOME A MEMBER OF CLUB TRESemm AND RECEIVE A FREE SHAMPOO AND CONDITIONER SACHET

As a member of this professional hair care club, you will be the first to hear about new product launches, promotions, competitions - everything and anything that is salon-style. In addition, you will be kept up to date with the latest trends from the international catwalks and step by step instructions on how to achieve those looks.