Total wind block serious weather protection with oodles of style. Stunning and beautifully cut. The soft shell is lightweight and soft. The sleeves zip off, to reveal a t-shirt length sleeve. The sleeves can be stowed in the back zip pocket. An extremely high quality garment. We love it! A medium equates to a size 12. The Phantom Lady was our best selling garment at the TCR show earlier this year; our customers loved the fit and quality. Phantom then went on to enjoy great success at the London Triathlon show, this is more than a long sleeve top having the protection qualities of a jacket, but with out the restrictions. The Phantom totally justifies its price tag it is superb!!