When I bought my Wave, that large size holster is what came with it. If the holster is worn horizontally, the tool can work itself out (I seem to remember reading threads discussing this issue). I also have a camo Fuse that came in a camo nylon holster; The holster was the same (large) size that my Surge came in, so the Fuse "flops around" (but it won't fall out due to the Velcro closure).