Baselayers. We stock menís Baselayers from a number of top brands including Odlo, Helly Hensen, The North Face, Rab, Berghaus and Regatta. If you are after a baselayer for high impact activities, then the polypropylene baselayers will keep you dry and comfortable. If itís winter warm thermal underwear you are after, then take a look at merino wool base layers. Base layers are an essential piece of clothing for any outdoor enthusiast and the starting point for an effective layering system.