We will only take you to La Grave (or on any other off-piste route) if you are wearing an avalanche transceiver and carrying a shovel and probe. If you do not have these we can rent them to you for 10 euros.
We recommend that skiers use off-piste specific skis as these will make the day much easier. You can rent suitable skis from several shops in Les Deux Alpes. If you need advice, ask at the office, or speak to an instructor when you do the La Grave test.