I have the Leggera vest and the jacket. I love them both. They are surprisingly warm. You would think because they are so thin they wouldn't do much, but they block the wind completely and keep the warmth in so you feel very comfortable. I use my vest under a regular cycling jacket when it is below 50 degrees. If I get too hot I have the option of taking off the vest or jacket. The Leggera packs down to a little sack that is included. I think that the Leggera vest and the jacket are the best pieces of cycling clothing that I have purchased because you can wear it in all cold weather conditions and since it's so thin it makes a perfect under layer to a jacket. The Leggera jacket is form fitted so the "filling with air" is minimal. I have been very happy with this purchase!