I've made a few body lotion bars. They are temperature specific. If it has too much wax, at a cold temperature, (room temperature in that location), it will not melt easily on your hands. If it has too little wax, at a hot temperature (room temperature in that location), it will melt before you want it melted.
They are made with no water because water is the perfect substance to grow bacteria. Lotion bars are all made of oils and wax. The perfect proportion of wax and oils, depends on your room temperature and the types of oils used, in your location (temperature) at that time. I live in a climate that has a 100 deg F difference depending on if it is winter or summer here.
Lotion bars are made to lubricate and seal the natural moisture you have in your skin. The point of using them is to minimize the evaporation that naturally happens to the moisture in your skin.
If I was buying one, I'd get one that has more wax and less oils, and then take my time melting them onto my skin. Hold it in your hands, let it soften, then begin to rub it across your skin. This kind of bar, the hard waxy type, will not melt when you don't want it to, at a high temperature, say 80 deg F in the middle of summer. I hope that helps.