This article presents a laboratory study that has been conducted to evaluate two different WMA technologies – chemical (using Rediset WMX®) and organic (using Sasobit®). The properties of bitumen after modification with two different dosages of each WMA additive have been tested at a wide temperature range. The results suggest that the binder, containing Sasobit®, at in-service temperatures and short loading times that are typical for traffic, has improved elasticity and lower viscosity if compared to pure bitumen. Rediset WMX®, however, had only minor effect on the binder properties.