A composition for inhibiting the growth of microorganisms on non-cellulosic fibers having a moisture regain of ≦5%, comprising;i) 1 to 50 wt % of at least a self-crosslinkable resin;ii) 0.25 to 20 wt % of at least a catalyst;iii) 0.1 to 4 wt % of at least an antimicrobial active agent, reactive with the resin;iv) 98.65 to 26 wt % of water;wherein i)+ii)+iii)+iv)=100%.