This is an inner vest from Komine. I bought it and tried it on, but I never used it and it's been stored away. I'd like to pass it on to someone who will use it. Please refrain from purchasing if you are concerned, as it is a used item. Thank you. The following is a product description: An inner vest with a center zipper that can be worn with any jacket. Made of three-dimensional air mesh for cushioning and breathability. It creates a pathway for air to flow between the jacket and the rider's body, eliminating uncomfortable stuffiness in areas that come into contact with protectors, such as the chest and back!! This item greatly improves comfort in the summer.