Litra Torches can get -really- hot when they're on for a while. The silicone sleeve offers not only grip, but some insulation against that heat. Unfortunately, since all of the Litra Torch modifiers snap over the front the the light, it is necessary to remove the sleeve, thus negating the enhanced grip and heat insulation it provides. Beyond that, given the things I initially noted, I think the sleeve would be an outstanding inclusion with every Litra Torch, without the necessity of having to purchase it as an add-on.
Very handy sleeve to protect the LitraTorch 2.0