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Whether you’re a beauty novice or a confirmed fashionista, this topic is for consulting Mumsnetters on all things style-related. Plus, check out our Swears By page for the inside track on the next Mumsnet must-have.
If worn for playing sports or running, it is usually a compression layer (which is meant to do something useful about blood flow and minimising lactic acid production) or if it's frigging cold it'll be a thermal layer (with or without compression). Shorts are warn to prevent lunchbox display.