DWR works by altering the surface tension so that the water beads on the surface rather than absorbing into the fabric. If you wear something over the top of it then this process isn't going to work as the outer layer will prevent the beading properly...
DWR on a baselayer makes no sense though.
DWR works by altering the surface tension so that the water beads on the surface rather than absorbing into the fabric. If you wear something over the top of it then this process isn't going to work as the outer layer will prevent the beading properly...