I absolutely love this jacket. So many great features, but most excitingly it kept me warm and effectively wicked sweat away. I tend to easily get cold, but felt so comfortable running in 20 degree F temps with only this jacket and an underarmour long sleeve. I love the it cinches at the waist, and that the hood stays on my head! There's a rim too, so if its precipitating, it should just help keep the rain from getting into my face. Plus the sleeves have a little elastic, so they too stay in place. Also, I think it looks so cute on! I was hesitant to purchase it because of the cost, but think it is so worth it. Personally, I run a bunch, and look at it as investment into some good gear. For reference I am 5'5", approx 135 lbs and the medium fits perfectly.