Wearable watches that help consumers obtain a better understanding of their eating patterns; wearable clothes that send signals to treating physicians; smart watches: they are but a few examples of the increasingly available and increasingly sophisticated “wearables” on the EU market. These technologies are an integrated part of many people’s lives, and in some cases allow healthcare professionals to follow-up on the condition or habits of their patients, often in real-time. How do manufacturers determine what wearables qualify as medical devices? How do they assess whether their devices need a CE-mark? Must they differentiate between the actual “wearable” and the hardware or software that accompanies them? In this short contribution, we briefly analyze some of these questions. The article first examines what “wearables” are, and when they qualify as a medical device under current and future EU rules. It then addresses the relevance of the applicability of EU medical devices rules to these products. The application of these rules is often complex and highly fact-specific.