Use of a particle having a particle size in the range of from 10 nm to 1000 [mu]m, wherein the particle comprises a polymer shell and a core; wherein the core comprises a phase change active, which is a material having a thermal phase transition temperature in the range 24 to 39 DEG C to provide long lasting in-wear comfort, selected from comfortable feeling, softness during sweating and mixtures thereof, to the wearer of treated garments.