The purpose of this Recommendation is to describe characteristics, specific requirements and capabilities of the IoT for support of Wearable Device Services.. From an IoT requirement perspective, the Wearable Device Services are classified in this Recommendation in four main categories: wearable device related multimedia services (WDMS), wearable device related health management services (WDHS), wearable device related sport services (WDSS) and wearable device related assistant services (WDAS). Wearable devices can be categorized according to their usage (WDS class). Specific requirements and capabilities of the IoT for support of different WDS and related wearable devices are described in detail. Furthermore, information concerning relevant use cases for wearable devices and related services is provided in appendix. Further information about the categorization of wearable devices and related services is provided in the appendix.