Material comprising a flexible porous hydrophilic polymer foam or fibre matrix comprising two matrix faces and therebetween a structural matrix framework defining a network of cells, having a cell network surface and therein a network of pores and a powder charge comprising antimicrobial additive and/ or wound dressing additive, wherein said powder charge is comprised at said matrix face or faces and/or within said cell network or within said structural matrix framework and wherein said additive is micronized, wherein said micronized additive has single particle size population greater than or equal to 1 micron and/or has loss on drying (L.O.D) less than 2% and/or said powder charge additionally comprises and flowing agent and/or bulking agent wherein micronized additive is co-located with said flowing agent and/or bulking agent, method for the preparation thereof comprising micronizing said additive and dosing powder charge to said matrix or a reactive phase for the manufacture of said matrix, devices comprising said material and uses thereof.
