Just spent 3 hours running through torrential rain and this jacket kept me warm and dry. Yes I got slightly damp due to sweat but most of that was wicked away so my t shirt was only slightly damp. Given the price of the jacket, I think the performance was excellent and I can't imagine that I'll wimp out of a scheduled run due to rubbish weather. I'm 64kgs and 172cms tall (OK short!) and the size small fitted perfectly. Overall I wouldn't hesitate to recommend this jacket or Start Fitness. Excellent service and tremendous prices.