The present invention relates to a free flowing powder composition with a particle size at most 800 m comprising: (a) 100 parts by weight of one or more styrenic block copolymers, at least one of which being a block copolymer (a1) comprising at least one block S having a glass transition temperature Tg above 25 C., which contains polymerized units of a vinylaromatic monomer and at least one elastomeric block B/S having a Tg below 25 C., which contains polymerized units of both a vinylaromatic monomer and a conjugated diene in random sequence, wherein the phase volume ratio of block S to block B/S is chosen so that the amount of the rigid phase in the total block copolymer is from 1 to 40% by volume and wherein the amount of the conjugated diene is less than 50% by weight on the whole of the copolymer; optionally (b) 0 to 200 parts by weight of plasticizing oil; optionally (c) 0 to 200 parts by weight of a compatibilizing resin; and optionally (d) a dusting agent in an amount of from 0 to 10% by weight based on total weight of composition. It also relates to a process for the preparation thereof and to homogeneous layers derived therefrom.