 One compound called styrene-butadiene rubber is a form of synthetic latex used by Talalay Global and is mixed with the latex from the Hevea tree to form the final Talalay product.Vita Talalay in the Netherlands still produces a Talalay product that does not contain styrene-butadiene and uses the latex from the Hevea tree as the entire base.The process utilizes a closed mold with pre-vacuum, followed by freezing to maintain uniform bubble geometry.