It's the quintessential acid test where any flaw is exaggerated by the sheer nature of a demanding sport with no room for extra weight or lack of quality. Ever run more than 5km in a vest or shorts that chaffe? 'Poly-shorts' have finally been banished to the corner and club vests are confined to big ASA races only. Now we have super lightweight, breathable fabrics with built in storage/earphone sockets and incredible windproof jackets that roll up tiny, each with a wide range of options for both trail and road running! We're keen to hear what's worth its weight in gold?