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9 T-shirt long sleeve 2020 p. 50 There are actually working situations where some enhanced visibility is wanted but full EN ISO 20471 visibility is neither required nor desired for different causes, e g that reflections may affect machinery light sensors. This category, which is not covered within the EN ISO 20471 classification system, It carries, however, enough visibility features to significantly improve safety. The visibility parts are generally over the shoulders, which in practise keeps those surfaces away from the worst wear and dirt.