The castelli womens indispensable jacket brings together the amazing windstopper 150 soft shell outer layer that castelli use in the alpha jacket and the soft and warm polartec thermal pro high loft fleece liner these two fabrics give a feeling of luxury while offering the best performance available castelli are pretty sure youll want to wear this jacket all the time so they gave it styling thats less rave but looks great on the road on your mountain bike or even coming home from spin cla