This European Standard specifies safety requirements for construction, performance, sizing and marking for swimming devices intended to assist users with movement through the water in the early stages of water awareness, whilst learning to swim or whilst learning part of a swimming stroke. It also gives methods of test for verification of these requirements. This part of the European Standard, Part 2, covers class C devices that are designed to assist with swimming strokes and improving specific elements of the stroke, which have either inherent buoyancy or can be inflated. It includes devices that are held in the hands or by the body. It does not apply to pull buoys, buoyancy aids, lifejackets or aquatic toys.