What are stubby holders made of?

Stubby holders are traditionally made from Wetsuit Rubber, Neoprene. This can be screen printed onto or also heat sublimated onto. They come in 5mm and 3mm types but 5mm is the best for your hand and drink. Stubby holders also come in a range of sizes, they are now made for wine bottles, slim premium drinks like Corona or Smirnoff, the list is endless.