Pure vol exposure

VIX futures won't do - but perpetual swaps will get the job done.

Now, I would like to bring attention to a different product in a different market - perpetual swaps on BTC, that afaik were first introduced at Bitmex, and now trade on Deribit and Cryptofacilities. Perpetual swap is actually a spot-like instrument, that pays "dividend" if swap midprice is below index, and requires "dividend payment" is swap midprice is above index. These payments insure that swap midprice does not stray far off the index.