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This document specifies safety and in water performance requirements for construction, sizing, marking and information supplied by the manufacturer for swimming aids intended to ensure a degree of buoyancy to assist beginners with movement through the water while learning to swim or while learning part of a swimming stroke. It also gives methods of test for verification of these requirements. This document applies only to swimming devices that are designed to be worn, to be securely attached to the body and which have either inherent buoyancy or can be inflated. It only applies to class B swimming devices intended to introduce the user to the range of swimming strokes. It does not apply to class A or class C swimming devices, to pull buoys, swim rings, lifebuoys, buoyancy aids, lifejackets or aquatic toys. This document is not applicable for products known as 'baby neck rings' aiming to keep the user's airways above the water level.