Combars (combination bars) are, as their name implies, mixtures of synthetic actives and soap. They attempt to combine the economy and processability of soap with the mildness and other benefits of syndets.
To facilitate the production of combars on standard finishing lines, 25% or less of the syndet component is typically added, although higher levels are technically feasible. "Lever 2000, made by Unilever in the US, is the leading combar product. The syndet coactive is sodium cocoyl isethionate.