Natural Merino Blend Insulation The absolute best of both worlds, the BaaBaa Blend L/S Baselayer combines the great temperature regulation and odour controlling properties of merino and the excellent moisture management properties of synethic fibers. It works fantastically well as a baselayer but equally well as a stand-alone long sleeve top. It is always top of our athletes' wish lists. The cuffs and neck are in a light rib merino knit. All seams are flat locked for comfort.